Brand New 950pcs Rubber Round O-ring Watch Gasket Size 12-30mm Ladies & Men Dia 0.50mm Or 0.60mm This is Gasket for the watch that keep your watch water resistant. 950pcs Gasket From 12mm-30mm each sizes in seperate package include 50 pcs fit all kind of watches-Ladies-Men. thickness for all is one size 0.5 mm Or 0.60(please confirm which thickness you interested in) This is excellent for most watches,especially if you are doing watch battery replacement. 100% New,Never Used Before.