All Dynamax standard balls are 14" in diameter Moisture resistant covering Made from 70% post-consumer recycled material Dimensionally stable and balanced Each ball is handmade in the USA Dynamax brings athletic medicine ball training to the group fitness arena! Authentic high performance training methods to help your members train like athletes. Timed intervals combining locomotion, groundwork and rotation will help foster the Dynamax 10 general physical skills. With the Dynamax 30-minute group formats your members can now experience what Dynamax means by "Fun Work. Hard Play." SPECIFICATION: Brand Origin Usage Home Use, Commercial Use Condition Brand New Warranty 2 year limited warranty after date of purchase. Warranty is voided if product is abused by repeated impact on a rough, aggregate surface or slamming the product on the ground from overhead.