Curling, also known as curling and curling, is a throwing competition on the ice with a team as the unit. It is a Winter Olympics competition and has a curling world champion. There are two events for men and women, with four people in each team. Curling is round and made of natural granite in Scotland, without mica. All the natural granite used to make high-quality curling in the world comes from an island off the coast of Scotland, and only the Scots have mastered the technology of making the world's top curling. The circumference of curling is about 9 1.44 cm, the height is about 1 1.43 cm (from the bottom to the top), and the maximum weight (including handle and plug) is19.96kg.. Brushing ice is to reduce the friction between curling and ice. Some people call curling "chess on ice", and this metaphor well explains the mystery and elegance of curling.