For Apple watch series 9 Ultra 2 8 Ultra 7 6 5 SE 4 3 2 138mm/40mm/41mm is universal,42mm/44mm/45mm 49mm is universal.Note: Just the watchband only, not including the watch. Compatible with all Apple Watch models including Apple watch band 38mm 40mm 41mm 42mm 44mm 45mm Series 7 (2021) Series 5 (2019), Series 4 (2018), Series 3 (2017), Series 2 (2016), and Series 1 (2015).
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