Hockey pucks are small, dense, and flat rubber disks utilized in the sport of hockey. The rubber of the puck is vulcanized- mixed with other additives- in order to make it stronger and more resistant to the cold. Pucks are only an inch thick, with a 3-inch diameter, weighing in at only 6 ounces. Hockey pucks for youth players may be an ounce or two lighter, making it easier for them to get it into the top corner of the net. Before professional games, the pucks are frozen to allow them to travel at higher speeds when passed or shot and prevent any bouncing effect off of the players' sticks. Game pucks are always black in color in order to provide better visibility for players on the white ice.