NHL San Jose Sharks 30th Anniversary 2021 Official Game Hockey Puck (6oz. 1x3"). Showcased in a clear acrylic presentation-worthy cube. Inglasco Inc. is the exclusive game puck supplier to all 32 NHL teams. The back of your official team game puck features the NHL shield printed with patented heat sensitive ink it turns purple when frozen just like the actual puck used in every NHL Game!