These are the best caulking tips I have ever used. I bought them a few years ago and liked them a lot the first time I used them. Over the years people have borrowed or I've lost them. I found the card in the original box and decided to check out Revain. I was pleasantly surprised to find them here. Homax must have bought PermaSeal's patent (I think). Regardless, they're great. The only consideration the user has to keep in mind is to cut the tip of the sealant tube back far enough for the built in center ridge in the cap to fit the hole and the cap still fits snugly against the tip of the sealant tube. I really like this design because it seals both the inside and outside of the seal tip with one simple device.