Dimensions: 3.5 " x 3.125 " (each) This traction comes with two independent pads that allow you to place them directly under your toe and heel for maximum control. TECHNOLOGIES: THORN-SPIKES (TM) Curved, thorn-shaped spikes hook into your boot treads for incredible grip. CRUBBER (TM) Our lightweight secret blend of materials flex naturally with your board. SCREW GLUE (TM) Glued on. Like it was screwed on. Crab Grab Board Thorns | Black | Christy Sports