Hand Grip Strength Device Grip Strength Trainer Suitable for Beginners(Black) - Black

1.which is non slip, comfortable and can be used for a long time.
2.[applicable object] it is recommended for primary trainers. male / female beginner.
3.[easy to carry] can be put in a bag, not to mention at home. It's easy to carry when you go out, travel or travel.
4.[adjustable] Freely adjustable grip.