Band Material: Made of high strength environmental silicone rubber with black matte stainless steel buckle. Thickness: 2.7mm-4mm. Washable and Waterproof: Perfect for outdoor fitness, sports, any type of workout, or everyday use. Giving tools. Interchangeable Bands: Free Replacement Tool Select Size: Measure the inner distance between two lugs on your watch case. The strap will only fit your watch if the width of the watch lug is the same as the width of the strap. Compatible: Designed to fit most traditional watches and smartwatches with a standard lug width of 14mm, 16mm, 18mm, 19mm, 20mm, 21mm, 22mm, 24mm.