Made of leather or artificial leather, cotton, rags, sand, etc. You can stuff it in the middle. The diameter varies from 3 1 ~ 39 cm, and the weight varies from 1 ~ 5 kg. There are five diameters and weights.

Hollow balls are mainly used for strength training of upper limbs, shoulder straps, back and lower limbs.

Spring clip dumbbell

There are N-type, A-type, five-spring grip and rubber grip.

(1) N-shaped grip, which is bent into an N-shape by a spring steel sheet with plastic handles at both ends. Small and portable.

②A-shaped grip, made of steel wire, looks like a pair of pliers.

③ Five-spring grip device, with five springs placed between handshakes for exercisers to increase or decrease springs according to their own abilities.

④ The rubber handle is a rubber ring with massage contacts, the size of a palm.

Gripper is mainly used for forearm strength training and palm and finger strength training.