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The black rubber puck is made up of a mix of vulcanized rubber, antioxidants, bonding materials and other chemicals to achieve a balance of hardness and resilience. NHL official size, 1 inch thick, 3 inches in diameter, and weigh 6 ounces. Materials all conform to international regulations stipulating overall dimensions and weight. Regulations apply to Pond hockey or on the Ice rink, suitable for adults and children over 8 years old to practice. The Overmont Practice Hockey Puck is a solid indoor or outdoor training puck. Featuring a tough and durable construction, the hard plastic will slide more efficiently. You can use them in many different ways. Use these also for pads between jack stands and car. It protects your car from the jack. May be used as mechanical vibration dampening isolators in places such as feet for light industrial air compressors, and air conditioning units because they are of regulation materials.