Description: 
This item is novel for its creative design, it's powered by pulling the string instead of battery, and you can adjust the force by adjust your frequency of wrist rotation. Made of quality materials, the ball is durable and unbreakable, and with a anti-slip silicone loop, which helps to offer better grip to prevent slipping. The inner construction is precise and works with excellent stability and little noise. The LCD screen displays the rotate speed, maximum rotate speed, total rotation number, etc. And you can adjust the rotate speed via the button to meet your needs. This item is good for rehab, strength exercise for forearm and wrist, and helpful to blood circulation to relieve wrist pain.

Features: 
1. Made of quality materials, the plastic shell is sturdy and durable, the metal ball is made of and low temperature resistant material, unbreakable and wearable.
2. With a LCD screen displays the rotate speed, maximum rotate speed, total rotation number, etc.
3. With a anti-slip silicone made loop, offers firm grip.
4. Precisely constructed, works excellent stability and little noise.
5. Good for relieving wrist & arm pains and helpful for strength exercising and agility.

Specification: 
Materials: Metal & PC & Silicone
Color Options: Red; Blue; Green; Yellow; Purple; Transparent
Diameter: 73 mm / 2.87 inch 
Height: 63 mm / 2.48 inch
Weight: approx. 300 g    

Package Included: 
1 * Force Ball
1 * Lanyard
1 * String (for starting the ball)
1 * User Manual

Noted: 
Please keep the opening side (the side with no screen) downward while using it.