Smart Electronic Counting Grip Adjustable Men Arm Muscle Exercise Finger Trainer(Black)

1. Material: abs+nylon+metal
2. Acting part: hand
3. Rotate to adjust the strength, free to choose 5kg-60kg
4. Embedded 2.5mm carbon steel spring, safe and durable
5. 3-bit intelligent electronic counting, no omission, lightweight and portable
6. One-key quick zero, efficient exercise, convenient for repeated training
7. Comfortable handle, delicate fit, ergonomic bionic design, no abrasion of the hand, do not slip off
8. Weight: about 229g
9. Size: about 15 x 11 cm