Black turf for visually presentation of training with chalk lines, marks, circles, Xs and written goals. Includes 2 large pieces of sidewalk chalk. Thick 4 inch bright red line sewn into turf on all mats for important pitchers stride line. Step down rubber that simulates game mound drive foot position to increase pitchers power drive. Teaches proper toe down for softball and drive angle for baseball. Mini mat is longer at 3 ft. vs. standard 2 ft. 3 inch mini mats. Extra 9 inches adds more room for Power Drive and Toe Tunnel mounting, more Fastpitch toe drag area for visual measurement, increases mats anti skid contact to floor surface. Heavy duty 100% USA construction. Extremely thick and dense turf mat. Spike proof 36 oz. turf weight per square yard. Weight is 109 oz. per square yard with height of turf height at 3/4 inch. Built to last in USA for all ages, youth through professional. New 3 foot by 3 foot Mini Mat with foam back and anti skid pad for any hard floor surface and outside use. Best warranty of any training mat - 2 years.