Har-Tru tennis court surfacing material is the oldest and best known product used in the construction and resurfacing of sprinkler irrigated clay tennis courts. Har-Tru is made from a billion-year-old Pre-Cambrian metabasalt stone found in the Blue Ridge Mountains of Virginia. It is a natural green stone that is extremely hard and angular, two very important qualities when it comes to tennis court construction. The angularity helps the stone particles lock together to form a stable playing surface and the hardness provides exceptional durability. The natural dark green color is classically clay and instantly recognizable. 10-S Tennis Supply is the largest distributor of Har-Tru surfacing material in the world. You can purchase Har-Tru from 10-S Tennis Supply in 80 lb., 50 lb. bags or bulk bags for contractors. Please call for pricing.