Our rubber straps are made with high grade FKM rubber, which is very flexible, extremely tough and super comfortable to wear. FKM Rubber is a high density material, yet soft to touch, which makes it a great choice for a watch strap. FKM Rubber Stainless Steel fittings Adjustable length 125mm - 170mm (end to end closed) Quick-release spring bar (straps can be changed without the need for any tools) 22mm lug width Designed to fit all Ocean Explorer models