SPRI® Slam Balls "4mm" fits comfortably into the arch

fits comfortably into the arch of the foot and provides a gentle massage with three rows of four independently spinning wooden balls

non-slip surface is “sticky” for extra grip

textured base doubles as massage tool

6" x 10mm thick

100% eco-friendly natural rubber

SPRI® Slam Balls "4mm" fits comfortably into the archThe 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,