This ProMounds Little League Portable Mound is ideal for little league and for players 12 and under. Comfortable to any pitcher 5' tall or taller and made of durable .25" reinforced fiberglass. The high-quality turf top is adhered to the mound with an agggressive outdoor adhesive. Rubber sleeve surrounds the edge of the mound to enable indoor and outdoor use. Easy to transport and use on any field and will not damage gym floors.