Places for curlers can be found in the form of rinks, which are five-letter structures specifically designed for the sport of curling. Rinks are typically constructed with a flat, smooth surface of ice, and feature a set of concentric circles at each end. The circles are used to mark the target area for the curling stones, and the rink is surrounded by a raised border to contain the stones. The rink also includes a hack, which is a foothold that allows the curler to push off from when throwing the stone.