44mm/45mm/46mm/49mm (Series 3/2/1) fits wrists 5.9"-8.1" (150mm-205mm). 38mm/40mm/41mm/42mm (Series 11/10) fits wrists 5.1"-7.3" (130mm-185mm). Perfect Compatibility: Our premium sport silicone bands are designed to fit a wide range of Apple Watch models, including.
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