WOODCRAFT STANDARD LENGTH UNIVERSAL REPLACEMENT FRAME SLIDER PUCK - BLACK Pucks are sold individually. If you need 2 pucks please put the QTY at 2 These solid replacement pucks are made of Delrin plastic and work on nearly all models of Woodcraft sliders. It's a good idea for racers to carry a spare in the toolbox. They are replaced with the single perpendicular bolt. If you have any questions about the fitment of these pucks to your Woodcraft frame sliders please contact us What makes the Woodcraft design unique is the perpendicular attachment bolt for the puck. Because Woodcraft does not have to hollow out the center of the puck, they can leave the sliding surface of the puck solid. This provides 48% more plastic to slide on, dramatically improving puck life. The side mount also eliminates the hassle of trying to dig out a puck replacement bolt through a distorted hole.