1、4 Different Sizes. It offers 18mm, 20mm, 22mm and 26mm. Please confirm the width of watch strap first to choose the appropriate size. 2、Anti-slip Design. It is design with anti-slip bar to well inserted into holes of the strap, not easy to fall off. 3、Skin-friendly Material. Made of high-quality silicone, it is soft and durable, offering comfortable wearing experience. Feature: 4 Different Sizes It offers 18mm, 20mm, 22mm and 26mm. Please confirm the width of watch strap first to choose the appropriate size. Anti-slip Design It is design with anti-slip bar to well inserted into holes of the strap, not easy to fall off. Skin-friendly Material Made of high-quality silicone, it is soft and durable, offering comfortable wearing experience. Classic Black & White It comes in 10pcs black or white strap fasteners. One loop can already secure your watch strap. Waterproof It is water and sweat resistant. Compatibility 18mm strap fastener: compatible with GARMIN Venu 2S, vivomove 3s, Garminmove3S, vivoactive 4s, GarminActive S; 20mm strap fastener: compatible with GARMIN Venu Sq, venu, vivomove3, Garminmove3, vivoMove Luxe, GarminmoveLuxe, vivoMove style, Garminmove style, vivomove (HR sport version), vivoactive3 (music), Forerunner 245 (music), Forerunner645 (music); 22mm strap fastener: compatible with GARMIN Venu 2, vivoactive4, GarminActive; 26mm strap fastener: compatible with GARMIN Fenix 5X/5X Plus/3/3HR. Specification: Material: Silicone Size: 18mm, 20mm, 22mm, 26mm (Optional) Color: Black, White (Optional) Packing list: 10 * Watch Strap Fasteners 10 * Watch Strap Fasteners