The Serene Imperial Jasper Apple Watch Strap features Jasper, a powerful spiritual stone known for its calming energy and protective qualities that ease fear and uncertainty. It helps you relax, get organized, and find a sense of inner tranquility throughout your day. Features Compatible with 38mm - 45mm Apple Watch face One Size Fits All: 6.0-10.5 inches (Please note that this measurement includes the watch face.) Materials: Imperial Jasper, Stainless Steel Handmade with Love and Carefully Manufactured.