Dilwe Air Pressure Rear, Soft Rear Frame Tail Air Pressure Accessory for Mountain (165MM) Air Pressure Adjustment: Achieve customized comfort with adjustable air pressure, inflate with using a pressure gauge. Shock Absorption: Experience superior shock absorption with this lightweight and sturdy accessory, designed to tackle the toughest roads with ease. Versatile Sizing Options: Choose from 3 sizes to suit your specific needs, ensuring the fit for a range of and bikes. Specification: Item type: Model: AO-38RC Material: aluminium alloy Classification: Manual control Optional length: Approx. 165mm/6.5in, 190mm/7.5in, 200mm/7.9in Hole diameter: Approx. 8mm/0.3in (Measured after adding bushing) Hole width: Approx. 24mm/0.9in Adjustment method: /locking/adjustable air pressure shaft: dark hard anodized aluminum AL-7075 diameter 10 mm (0.39 inch) shaft Dark color anodized aluminum Packing List: 1 x 6 x Accessory