Spring Grip Strength Ball Metal Grip Strength Training Climbing Fingerboard

Product information:
Material: chrome-plated carbon steel spring
Purpose: finger strength, grip strength exercise
Weight: about 168g
Length: length is about 10CM, waist diameter is about 5CM
Suitable: white-collar grip strength improvement, leisure play for the elderly, grip strength exercise for middle school students before physical examination, etc.
Features: strong and durable, easy to break, steel spring, grip exercise