The Proper Pitch Fold'n Roll mound is the perfect mound to learn proper body mechanics on a regulation slope. The lightweight design makes transport easy and it can fold up and roll away in a matter of seconds. The mound is weather resistant enough to stand-up to indoor or outdoor use. The non-slip, non-marking back will protect your gym floor from any damage. The mound is made with spike-proof 44 oz sq. yard artificial turf and has a regulation replaceable pitching rubber.