Designed with a soft cover and pliable filler free of any hard edges or rims4 ½" in diameterUsed for strengthening, plyometrics, balance training, mobilization and functional grip strength developmentUse for one- or two-hand activityComfortable to holdEach weight labeled in kilograms and poundsIncludes professional instruction manualRed, 3.3 lbs./1.5 kg