Mckune Design's FR4 High Bite Vented Slipper Pads were developed for use on high traction surfaces, such as carpet, AstroTurf and clay. The FR4 epoxy fiberglass laminate material helps prevent glazing, while the venting slots help to regulate the temperature of the slipper assembly for a consistent feel throughout your run with no fading. These pads fit TLR slipper assemblies and the package includes two slipper pads.