SPRI® Slam BallsThe SPRI Slam Balls are designed to last any med ball slamming activity. They are a uniquely durable, evenly weighted, one piece roto molded medicine ball that you can bounce and slam on any surface surfaces and still get consistent rebound response. The basketball style grooves and tacky surface texture ensure a firm grip, even when wet. These slam balls can also float for water based training. Sold in color coded weights ranging from 6 to 12 pounds,