15 mm Rubber Button Repair and Replacement for Crocs Rivet - Set of 4 Lifetime Guarantee (Black) Extremely durable and high quality because it is manufactured with the same rubber and injection molding process used in making flip flop straps. Moderate stiffness and consistency as a flip flop strap rubber. Can be used to replace flip flop strap with this button to create your own flip flop design Can be used to repair buttons that need durable rubber or replace rivets in some cases Rubber pop in rivets you can use to repair your (Crocs or leading brand) lightweight foam clogs (as well as any brand) when the factory rivet that holds the back-strap in place breaks. Easy to install rivets you will retain full functional movement of the straps. It takes less than one minute per rivet.