* Choose Weight & Size :Perfect for practice and competition with a range of weights/sizes available to all age groups. * Standard Build: Standard dimension for each weight. * Smooth Finish: Each ball comes in round shape with no dents. * Accurate Weight for practice，+/- 3% tollerance. * Anti-Slip Durable Construction: Made of cast iron for longevity and durability 10Cent Shot Put Color Series Case Iron for Outdoor Track & Field (6lb/2.76kg to 16lb/7.2kg)