Original: A standard ice hockey puck is black, 1 i thick, 3 i in diameter, and weighs between 5.5 a; some pucks are heavier or lighter than standard (see below).
Simplified: Hockey pucks are hard disks of rubber that are used to play ice hockey. A standard ice hockey puck is black, 1 inch thick (25.4 mm), 3 inches in diameter (76.2 mm), and weighs between 5.5 and 6 ounces (156-170 g).