ROK DROP tear drop pucks are ideal for racing, track days and normal road use. The velcro backing is stitched tight to the puck insuring no separation. ROK DROP Sparkies use the same basic puck as the regular tear drop but have no fewer than 6, 6mm pure TITANIUM rods embedded within them to create an impressive spray of sparks and are constructed from A.B.S. for ultimate wear and “skim” excellence.