Smart Hockey VPSLIDER in-line hockey puck Properties: 4oz Silder Speed Puck. Use it before a match to warm up. Practice with it in the garage, basement, or on a flat, hard surface. Our Slider has a patented, vulcanized rubber that is located between two sliding discs. Vulcanized rubber is the same material used to make ice hockey pucks, making our puck more durable than the competition. Whether you train on smooth concrete, on the street, or in your basement, you'll be amazed at the speed and smoothness of the Slider discs.