To represent a real-size dragon, with various applications
Dragon models are magical, realistic models of dragons. These models have various usages, such as roasting chestnuts and, presumably other foods. Also, they were used by the Triwizard Tournament champions who each drew small model dragons out of a silk bag prior to the First Task. The type of model indicated which dragon they had to face. A long time after the Second Task, the miniature figurine of Viktor Krum was seen trying to fight Harry Potter's dragon model at the Gryffindor Boys' Dormitory. In Diagon Alley in 1996, there was a dragon model in the roast chestnuts sale machine.