and high qualityOOTDTYMaterial: Plastic, Aluminum AlloyColor: BlackSimple to install and comfortable to usePractical and durable, anti-skid designSuitable for: mountain bike, ,cycling and so onLength: Approx. 5.12inch/13cmOuter diameter: Approx. 1.26inch/3.2cmInner diameter: Approx. 0.79-0.85inch/2-2.15cm (Adjustable)Quantity:1 PairNote:Due to the difference between different monitors, the picture may not reflect? the actual color?of the item. Thank you!