Size Chart and Multiple Choice: 38mm/40mm/41mm/(Series 10 42mm) S/M size is suitable for 5.1"-7.28" (130mm-185mm) wrist; 38mm/40mm/41mm/(Series 10 42mm) M/L size is suitable for 6.1"-8.07" (155mm-205mm) wrist; 44mm/45mm/46mm/49mm/(Series 1/2/3 42mm) S/M size fits 5.5"-7.48" (140mm-190mm) wrist; 44mm/45mm/46mm/49mm/(Series 1/2/3 42mm) M/L size fits 6.3"-8.27" (160mm-210mm) wrist Compatible Models: Sycamond soft silicone band compatible with Apple Watch 41mm 40mm 38mm 42mm 49mm 46mm 45mm 44mm, iWatch Series SE 10 9 8 7 6 5 4 3 2 1, Sport, Edition, ALL VERSIONS. High-quality Material: This cute strap is made of high-quality silicone and stainless steel material with Pin-and-tuck closure buckle. The silicone makes the wristband soft, sleek, lightweight, flexible, durable, water resistant and easy to clean. The stainless steel material buckle, nickel-free, hypoallergenic and more securely fastened. Classic Simple Design: The classic stainless steel buckle with a double-hole design is not only easy to put on and take off, but also makes the band more secure and comfortable to wear.In addition, we have a variety of popular colors for you to wear in work, daily life, leisure, fashion, and exercise occasions. After-sales Service: We offer a 1-Year warranty on our strap. For any problems, please reach out to us via Amazon Seller Messaging Service. We offer 24/7 friendly support.