Compatible Models: Smartwatch series ultra 49mmSmartwatch series 9 41mm 45mmSmartwatch series 8 41mm 45mmSmartwatch series 7 41mm 45mmSmartwatch series 6 40mm 44mmSmartwatch series 5 40mm 44mmSmartwatch series 4 40mm 44mmSmarwatch series se 40mm 44mmSmartwatch series 3 38mm 42mmSmartwatch series 2 38mm 42mmSmartwatch series 1 38mm 42mmSize Chart:38mm/40mm/41mm-S/M fit for 5.1"-7.1" (130mm-180mm)38mm/40mm/41mm-M/L fit for 5.9"-7.9"(150mm-200mm)42/44/45/49mm-S/M fit for 5.5"-7.5" (140mm-190mm) 42/44/45/49mm M/L fit for 6.3"-8.3" (160mm-210mm)Soft Material:Made of soft & durable silicone material, lightweight and breathable, water and sweat resistant. Giving you a comfortable and nice wearing experience.Secure design:With stainless steel rose gold buckle, keeping your watch safety at any time, such as running, swimming, mountaineering, riding bike, yoga, shopping, etc.Easy to install:There are watch lugs on both ends and the connection port is very smooth and firm, you can easy install or remove your iwatch bands.Package Include:You will get 15 Pack Silicone Bands for iWatch.