It is all same diameter 36CM for all sizes.
It is very strong.It is not easy breaking.
Spec:4lb,6lb.8lb,10lb,12lb,14lb,16lb

Medicine   ball:

1-It is all same diameter 36cm for all sizes.

2-There are pound and KG sizes.

3-Spec:4lb,6lb.8lb,10lb,12lb,14lb,16lb,18lb,20lb,25lb,3kg,4kg...9kg,

4-It is very strong PVC leather and not easy to break.

5-Colour: balck+ green/red/yellow/purple.....

6-carton box size:72cm*36cm*36cm