Spring Stress Ball, Grip Strength Trainer Ball Spring Stress Ball Hand Finger Thumb Exerciser Strengthener Enhancer for Stress Relief Finger FitnessRELIEVE HAND FATIGUE: Spring Stress Ball enhances finger flexibility, relieves hand fatigue and builds hand strength. Hand-held strength trainers are designed to improve strength, mobility and stress relief. You can also use these to overcome the habit of pulling nails and knuckles.MAKE YOUR FINGERS MORE FLEXIBLE: You can squeeze the Grip Strength Trainer Ball at will by holding it to reduce pressure and make your fingers more flexible. This stress-relieving toy is so easy to use that when you hold it, you can't help but squeeze as much as you want.HIGH QUALITY SPRING STEEL: Hand Finger Thumb Exerciser is made of high quality spring steel, chrome finish makes the product feel good and will not corrode from sweat, Hand Finger Thumb Enhancer is strong, durable, unbreakable, corrosion resistant, can be used for a long time, use finger strength and Grip strength exercises.SAFE DESIGN: Stress Relief Finger Fitness Strengthener With plastic caps on both ends to protect fingers from injury, the Thumb Grip Strengthener is ergonomically designed to fit in the palm of an adult man, squeeze it as you want.SMALL AND LIGHTWEIGHT: Finger Fitness roller is easy to carry indoors and outdoors, such as playground, camping, mountaineering, hiking, etc., it can improve the finger and grip strength of athletes, you can do hand and finger exercises in the office, school, anywhere, and also relieve some Tension and anxiety.Color: silverSize: length about 9CM, waist diameter about 5CMQuantity: 1pcKind tips:1.As different measuring methods,it will occur 1-3 cm deviation about the items,please ensure that it is okay for you before ordering.2. Because of different monitors and lamplight, the picture may not reflect the actual color of the item, really thank you for your kind understanding.3. Only the above package contents, excluding other products. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store