aulumu's second watch band, A02 Offbeat Sport Band, applied new design and material, but still same urban tech style with future aesthetic. This new band made from a high-performance fluoroelastomer, which is durable and strong, yet soft to wear. One-of-a-kind unsymmetrical adjustable holes make it unique to look. Channels design in the bottom of the band offer remarkable breathability and flexibility, ensures all-day comfort. For the closure, it applied an aluminum pin-and-tuck mechanism guarantees secure closure and gives the pin a fresh matte finish. Total 5 colors, choose the one fits your outlook. FKM fluoroelastomer rubber, lightweight and comfortable, weight only 35g/1.23oz. Waterproof and high-grade scratch resistance and color retention, built to last long. Interior ventilation channels and holes let water and air go through, provide breathability. One-of-a-kind  asymmetrical holes design, make it stand out. Custom aluminum closure pin, secure to close. One size fits most, designed for wrist sizes ranging from 175mm to 210mm. Wide compatibility, work for Apple Watch Ultra 1&2 49mm, Apple Watch Series 10(46mm), 9, 8, 7 (45mm), Series 6, 5, 4 (44mm), SE (44mm), Series 3 (42mm).  NOTE : NOT compatible with 38mm, 40mm and 41mm.