Sonic Inline Hockey Pucks are designed to help you improve your level of stick handling, shooting, and scoring. The perfectly balanced puck body is made of 3.5 oz PVC and matched with low profile runners for flatter play - like a puck, not a tennis ball. The longer lasting, one-piece runners are infused with Teflon to boost speed and cut drag, and because they"re one-piece, they won"t fall out after a hard slapshot. The body design features six power grooves to cut through the air and accelerate the puck off your blade, while also improving rebound off the boards, and dampening vibration. Made in the USA with high-impact polymers (no regrinds or scraps) - they cost more to make, but performs better in the long run. Taken together, Sonic Inline Hockey Pucks pack many innovations designed to improve your game. * Plays flat like a puck should * Slides easily with one-piece Teflon coated runners * 3.5oz and made in the USA