The for surfboard system has a more simplified and enhanced design and a red spring system that makes it one of the most unique surfboard devices. We removed the consumable parts of the old system, kept our red spring system intact, and strengthened the basic parts to make it lighter, more durable, and improved aesthetics. The new system is now unified on our own skateboard to make it more stable without sacrificing the well-known surfing process, making your surfing experience richer. Recommended for skateboarders over 50kg. Suitable for surfboards, longboards, double rockers, small fish boards colour:Black Material:Aluminum alloy Package Contents: 1 x bracket(The color of the shock absorber is random, and the specified color cannot be selected) 1 x auxiliary bracket 1 x 29mm gasket(The LOGO of the gasket is random, you cannot choose to specify the LOGO) 1 set x screws Only the above package content, other products are not included. Note: Light 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.