Coarse Blend tennis court material is used for top-dressing clay tennis courts. Coarse Blend consists of only the larger, more angular particles in the standard Har-Tru material. Coarse blend is typically used to add some sliding material and "grit" to subsurface irrigated clay courts (indoor & outdoor) and ClayTech courts. You can purchase Hydroblend from 10-S Tennis Supply in 80 lb. or 50 lb. bags. Please call for pricing.