Compatible Models & Size Options: These silicone Cute Flowers 40mm Apple watch band are compatible with Apple watch 38mm 40mm 41mm 42mm 44mm 45mm 49mm Series 9 Series 8 Series 7 Series 6 Series 5 Series 4 Series 3 Series 2 Series1 SE Ultra Ultra 2 all versions. The different size options for the wristbands, with the 38mm/40mm/41mm size suitable for wrists measuring 5.1"-7.1" (130mm-180mm) and the 42mm/44mm/45mm/49mm size designed for 5.9"-7.9" (150mm-200mm)