The stones (sometimes called "rocks") are made from a rare and dense granite that is quarried in Ailsa Craig in Scotland and then cut and polished.
Each one weighs 19.1 kg (42lb).
Competitors wear shoes that grip well on the ice.
Some have a slippery surface on the sliding foot or strap-on parts are sometimes connected to the shoe.
Players can use a broom to smooth the path of the stone as it travels down the ice.
These remove the tiny crystals of ice that build up on the rink's surface.
Most brooms have synthetic bristles, although straw brooms are also sometimes used.
Players begin their delivery from a "hack", a starting block made from rubber.
