Quick Release Watch Bands - you can change your watch straps in a flash. This is a quick-release FKM rubber strap having a cylindrical push button on one side for quick and easy installation and removal process without applying any tools. FKM - Fluoroelastomer, which is a class of man-made rubber of great density, made to stand harsh conditions, such as high temperature and chemicals, etc. This 20mm Quick Release Watch Band is waterproof, great for outdoor use and that's why FKM rubber strap is highly popular among divers and adventurers. Certainly, this is one of the best rubber watch strap replacement that works well with your dive watches.