Product information:
Color classification: Large spring [adjustable strength 7-70kg], small spring [adjustable strength 18-118kg], double-layer spring [adjustable strength 25-180kg]
Fitness effect: exercise arm muscles
Feature:
Double spring design
Engineering handle
Wrist trainer
Detachable components
Odor-free material
Bold metal steel pipe
Packing list:
Arm force device*1
