Review on Set of 3 Drilled Rubber Stoppers #7 - Versatile and Reliable Stoppers for Various Applications by Alfredo Nosrac

I ordered four sets of 3 stoppers. Half were of the same variety: Fermenthaus. The other half was The Vintage Shop. Both are #7 stoppers and are made to the same size specifications, but the Fermenthaus rubber is stiffer than a large eraser and the Vintage Shop rubber is more flexible than silicone. I use these for home brewing and while both seem to seal very well when the bottle and stopper are dry, the silicone rubber slips off when either surface is wet. Fermenthaus plugs don't seem to have this problem. One star off because I think they should be sold separately. And it disrupts my latent OCD.