BOSS Silicone Stopper IV

I mentioned in my review of the Tantus Ryder that, while being my go-to plug, it is not my favorite. That honor goes to this very special plug: BOSS Silicone Stopper IV by MODE-DESIGN (in all caps as is typical of Japanese usage of English).

The BOSS Stopper

While on vacation in Japan, I stopped into one of the many adult shops in the Akihabara district of Tokyo. As I browsed the shop’s five or six floors, I was amazed to come across this set of butt plugs. I would normally expect to see a few cheap, plasticky “novelties,” but these were made out of silicone, arguably the best material for anal toys due to its non-porous, sterilizable nature. And they were cheap too, around $25! Quality silicone toys like these often go for double that online. It was too good to pass up and my ass was hungry, so I bought the biggest model, a little bottle of Astroglide, and put it all into my backpack. I met up with my travel partner to hit up our next sightseeing destination, the Tokyo Government Building, which we planned to go to the top of before leaving for home that evening.

When we arrived, I noticed that they were doing bag inspections. I couldn’t let them or my friend see what I had just bought. So I turned back to dispose of the evidence. And what better way of doing that than hiding it in your butt? I found a bathroom, took the plug out of the box, and examined it.

First thought: It’s sooo smooth. It has a satiny matte finish like nothing I’ve ever felt before. The closest thing I can think of to compare it to is the “soft-touch” rubber backs appearing on some cell phones now. Now that I think about it, the finish on the Tantus A-Bomb comes close, but it’s still not nearly as nice as on this BOSS Stopper.

I put a little bit of lube on it and began to slide it in, conscious of the people just outside the stall door. My ass protested to its 2″ girth—it had been weeks since I had used a butt plug, and normally I’d need to warm up for one this big. With a little more lube, and a lot more pressure, I managed to get the plug in. It hurt, but it was in. I pulled up my pants and walked back out to the streets of Tokyo, my ass completely stuffed.

Thankfully, due to the plug’s slim neck, I adjusted relatively quickly. At 7/8″ wide, the neck is no bigger than a thumb. The base is pretty small for a plug of this size, measuring 3.25″ long and 1.25-1.5″ wide. The base has an hourglass shape which helps it to fit well between the cheeks, and feels very comfortable standing, walking, or even sitting for long periods of time. The bottom of the base does exhibit some hard right angles, but being 1/2″ thick, it sticks far enough outside the cheeks not to cause any pinching or irritation. Here it is next to a soda can for comparison:

BOSS Stopper Size

The BOSS Stopper ended up feeling so comfortable, and the large 2″ bulb sitting just inside felt so good against the lower part of my prostate, that I decided to keep it in for the rest of the trip and the 16 hour plane ride home. The only thing I made sure to do was to take out the small metal ring that came on the bottom, so as to not set off any metal detectors when going through security at the airport. The small metal loop which the ring attaches to is not removable, so I was still a little worried about setting off the detectors. Needless to say, going through airport security was nerve-racking and exhilarating.

Where the ring attaches to on the BOSS Stopper.

I made it through security (twice) without a hitch, though I would not attempt that again now that we’re in the era of backscatter X-ray machines.

Since that trip, I managed to wear it on a 12 hour car ride, and on another occasion, I kept it in for five days straight, taking it out only to use the bathroom. The Stopper’s relatively slim neck and small, well-shaped base make this one of the most comfortable plugs I’ve had the pleasure of using, and the thickness of the bulb means it’s still a very intense experience for the duration. I’ve even come up with some creative uses for the ring on the bottom involving small chains and locks 😉 Couple all of that with the one of the nicest, most luxurious materials I’ve ever felt, and you’ve got the complete package: my favorite butt plug.

If you can find the BOSS Silicone Stopper IV in your area or online, buy it!

6 thoughts on “BOSS Silicone Stopper IV

  1. You said the neck diameter is 7/8″ slightly under 1″? I am sure one could pull the metal loop all the way out; I mean, the loop base/post can’t be that deep in, can it? Is the density/softness of the silicone very similar to the tantus and/or doc johnson ones?

    • Yes, the neck diameter is slightly under 1″. The metal loop does seem like it would come out with a pair of pliers, but I wouldn’t want to. I have too much fun with attaching chains and locks to it to make a makeshift harness 😉 The silicone is nearly identical in firmness and quality compared to Tantus toys.

      Thanks for commenting. I should do a couple more reviews.

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  3. I was really intrigued after reading your description and wanted to try it. I’ve got a very large collection of plugs already, but this seemed like something really special. It is not available anywhere in the US as far as I could tell. i did find it at an online site based in Hong Kong, (for $50), but when I ordered it they wrote back saying it is not in stock, and offered me something else instead. Finally, after a few days of searching with many different criteria and search engines, I found it on a Japanese website for a much lower price, but it came to approximately $50 with shipping. It arrived today and I must say, after wearing it for about three hours, I think this is going to be my favorite plug as well. I think it’s perfect for all-day wear, which is what I was looking for. I’ve been plugging for years, decades actually, so have a pretty clear sense of what I want in a plug – and this is IT!

    I don’t know if anyone is still reading this blog, but if you happen to come across this post and are interested, the Japanese website that is offering the BOSS Stopper IV as of this writing is

    Thank you so much for bringing it to everybody’s attention.

    • Hi Steve,

      Thanks for the comment. I’m glad you were able to find this plug and that you enjoy it as much as I do. I’ve had it for over three years now and it still my favorite.

      I wish I had the chance to tell you before you went on a long hunt for it, but it looks like this plug is now being offered by EdenFantasys as the Velvet Plush Fulfiller. I’m 99% sure it’s the same item; just a different name.

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