gym weight ball Leather medicine ball. All size is same diameter 35cm.There are pound or KG size. gym weight ballIt is leather medicine ball.All size is 35cm diameter.It is stronger to trainer. spec:4LB,6LB,8LB,10LB,12LB,15LB,18LB,20LB,25LB.also the KG is OK.option color can be choose andyour logo can be add ,too.