Tamiya Hop-Up Options 54505 Rear Buggy Big Bore Aeration DamperThese dampers feature all new parts, and their main feature is the cylinder: it has an inner diameter of 12mm, 2mm wider than that on the standard Buggy Aeration Damper. As a result, it can hold 40% more oil and that means less wear and tear on the vehicle! A number of option parts have been released to increase setup options to these dampers such as different size pistons. HL coated damper cylinders x2 (new) Aluminum damper caps x2 (new) Aluminum