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The curling stone originated in Scotland from large chunks of rock bowled across the ice, none having any particular size or shape. They evolved into what are now matched sets of uniformly made stones, each weighing about 42 pounds. They are all made of pure granite and are amazingly hard. The best stones come from a single quarry on an island off the coast of Scotland. Due to manufacturing and shipping being quite expensive, sets of curling stones are owned by the club and not by individuals.
The stone is concave on both the upper and lower surfaces. The surface of the stone that actually touches the ice is a narrow circular band about 1/2 inch wide. This allows the stone to go farther, more accurately, and to curl more than would be possible with a flat surface. A handle, usually on a circular plastic disc, is bolted onto the stone.