These Wall Balls are made of the highest quality PVC which is built to last and is easy to clean & maintain. The double material coating is very robust and retains its shape after regular use. The minimal impact force gives its optimal throwing power and speed. Our handheld exercise ball comes with even weight distribution which is double-stitched, reinforced seams, making this workout tool quality at its finest. These balls of 3kg, 5kg, 8kg, 10kg and 12kg have weight marks clearly printed for easily identifying size and weight.