Come and see our amazing products. Tire gas cylinder is made of alluminum alloy,it is 1 3/16x7 11/16inch.he only chair cylinder replacement on Amazon to offer a cylinder removal tool. No more struggling and spending hours trying to remove your chairs old broken cylinder with tools you don't have. We will also make sure to help guide you through the entire process from start to finish. Pls confirm with us about the packing info, stock color and exact production time before placing your order.