TRX Slam Balls were designed to survive your toughest workout. Rugged, textured surface provides a better grip while the ultra-durable rubber shell absorbs impact. TRX Slam Balls are bounce-resistant and ideal for slams, overhead throw, lunges and functional, bodyweight exercises. Perfect for all fitness levels, TRX Slam Balls are available in multiple weights from 6-50 pounds and include a one-year warranty.