Heavy-duty wall balls are designed for a variety of workouts that stand up to the toughest athletes. The scaled weight range gives exercisers a way to progress and utilize unique functional training techniques. Hand-stitched seams provide more durability against heavy use and stitched numbering won't wear off. Outside Material Combination of synthetic polyester wool and rubber crush Inside Material Cork for increased durability Color Black Diameter 14" (all) Warranty 1 Year