★It is more Du-ra-ble and more concentric with hard chrome plating and grinding treatment ★High progress aluminum alloy, high strength, super stability, no deformation ★The material is thicker, which improves the stability of the cylinder and has impact resistance ★Imported sealing ring + thickened cylinder body, smooth for a long time without jamming, air leakage, wear-resistant and dust-proof ★If you encounter a problem during the purchase process, you can contact by email, and we will reply and solve it for you within 8 hours, Manufacturer: DCDCD