【Compatible Models】: Rauudk ocean band compatible for apple watch 49mm 45mm 44mm 42mm 41mm 40mm 38mm, for apple watch Ultra band, apple watch series 8 band, apple watch series 7 band, apple watch se band, apple watch series 6/5/4/3/2/1, all version. 【Premium Fluoroelastomer Material】: The Ocean Band for Apple watch is molded in a high performance elastomer with a tubular geometry allowing it to stretch for a perfect fit, even over a wetsuit. 【Titanium Buckle】: The Ocean Bands for Apple watch adopts new innovative corrosion-resistant titanium buckle design, with adjustable loop secure the band during high-speed water sports. 【Adjustment Size】: Move the adjustment ring to fit the desired position and fix it on the appropriate size. 38/40/41mm fits 130-210mm (4.9”- 8.2”)wrist, 42/44/45/49mm fits 130-220mm(5.8”-8.5”) wrist.