We've run out of expensive ones and need something urgently. Instead of paying $5 for 3 at the auto parts store, I threw in the dice and ordered them. Not the same as the 3m products I use almost exclusively, but about 1/3 the price, and here for a day with Prime. Surprisingly, they curl up well and the self-adhesive backing makes for a good seal. Higher temperature than 3m is required for good shrinkage, but be patient and keep moving the heat source. Higher shrink temperatures are probably good, especially if used in enclosed spaces exposed to heat; They won't soften or fall apart easily. We'll have to see how they hold up, but so far so good. Much better than non-adhesive shrink connectors.