Compatible Models: The Aenoko band comes in 42mm, 44mm, 45mm, and 49mm sizes, making it compatible with a range of Apple Watch models including the 42mm, 44mm, 45mm, and 49mm sizes in iWatch Series 9, 8, 7, SE, 6, 5, 4, 3, 2, 1, Ultra, and Ultra2 FIREBOLT Ring/ Ring Plus/ Ring Pro/ Visionary, PEBBLE Frost, Cosmos Engage, Cosmos Grande, W26, W26 PLUS, W26 PLUS PRO, T55, T55+, T500, T500+, T800, HW12, HW13, HW16, K16, K17, A2, i7 PRO MAX, i8 PRO MAX, Watch Ultra, Series 6, etc. It's important to verify your Apple Watch model to select the right size before making a purchase.