Feature:1. [Inlay] Ribs are mainly inlaid on the back of the board to protect your back from damage.2. [Floor Protection] A good helper for the bottom and steps to slide, so that you can slide more smoothly.3. [Wear Resistant] Using high quality material, the appearance is glossy, wear resistant and durable.4. [Easy to Install] Longboard rails ribs Bones can be installed at a distance of 1cm from the edge of the board, and it is easy to install.5. [Reduce Friction] Rib bones rails can reduce the friction of the bottom plate and protect your skateboarding.Specification:Item Type: Rib Bones RailsMaterial: POMSize: Approx. 35.7 x 1.8cm / 14.1 x 0.7in Package List:2 x Rib Bones Rails11 x Screws