Sonic Roller Hockey Puck Stable - perfectly balanced puck body matched with low profile runners for flatter play - acts like a puck, not a tennis ballFast - runners infused with Teflon boost speed & cut drag - 6 Power Grooves accelerate the puck off your blade, improve rebound off the boards, & dampen vibrationBuilt Tough - one-piece runner system - long lasting runners wont fall out after a hard slapshotPure - made in USA with high-impact virgin polymers (no regrinds or scrap) - costs more but performs betterVersatile - ideal for indoor & smooth outdoor surfaces