Double action trucks are made of high-quality aluminum alloy, light but durable. The roller skate truck replacement parts are cast in one piece, which is strong and not easy to break. Aluminum alloy truck castings are surface polished, smooth without bumps. The axle length on both sides of the roller skate plate truck is 33mm, and the axle diameter is 8mm. includes 8 pcs roller skate triangle trucks only, no other hardware and screws. Additional mounting hardware and screws not included!!! Please confirm before ordering! Colour:Silver Material:aluminum alloy Package Contents: 8 x roller skate triangle trucks Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.