Series Ultra: 49mm. - Series Ultra (2nd gen) : 49mm. - Series Ultra (3rd gen) : 49mm. For Apple Watch Series 3 4 5 6 7 8 9 10 11 SE Ultra Screen Protector Clear 38/40/41/42/44/45/46/49mm. - Compatible with Apple Watches 1 2 3 4 5 6 7 8 9 10 11 SE and Ultra series.
