I feel stupid for even needing to ask this question, but...
Long ago on my Wii drum kit I owned the official RB drum silencers with the Rock Band logo and the peel-and-stick backing. They were ok.
When I switched from Wii to Xbox I went looking for new silencers (I didn't want to peel off the used ones and lose their tackiness). I found some, I think at Gamestop. They're one solid color and when you put them on the kit they look like this:
These silencers use NO GLUE. They are a solid piece of some some kind of rubber with a form-fitted edge that snaps around the edge of the drum heads. You can peel them off and snap them back on repeatedly. When you peel them back they look like this:
I would love to have a spare set of these for myself (though I've been using them for close to two years now and they show almost no signs of wear) and a few sets for friends with RB kits. These things are amazing, but I don't have the packaging any more and there's no branding stamped on them, so I have no idea how to find them. Does anyone else have a set of these, or seen them in a store or online somewhere? Do you know who the manufacturer is and whether you can still order them?