Spring Grip Strength Ball Metal Grip Training

Product information:
Applicable scenarios: fitness equipment and sports trends
Color: as shown in the picture
Material: spring steels, plastic
Purpose: finger strength, grip strength exercise
Size: 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