Specification:

Made from rubber material, high quality;

                     Weight: 4 lbs.

Features:

  Non-slip surface make it easy to carry;

              With bounce ability ideal for body building;

              Different weight for people of different heights;

              Usual weights: 2lbs, 4lbs, 6lbs, 8lbs, 10lbs etc;  

Grreat for upper body strengthening;

              Exceptional abdominal exercise tool to improve strength in abs, arms, and obliques;

              Also popular with professional athletics, boxers, golf and tennis players.