Different hardnesses: hand exerciser has three different strength levels (soft, medium and firm), which gives you more choices to meet different needs. If you want to improve your finger mobility or restore the function of your fingers and forearms due to illness, you can use our stress ball for kneading Upper material: anti stress balls are made of environmentally friendly thermoplastic rubber (TPR). It's non-toxic and harmless due to chemical certifications like PAH, ROHS, and O-Benzene. It is specially designed for long-term and frequent use. Safe, environmentally friendly and durable. One thing fits all: stress ball was developed using human technology and fits perfectly on the palms of the hands, for small and large hands, seniors and young people. Hand exerciser is suitable for a wide range of people, is particularly suitable for sports and activities such as climbing, bodybuilding, fitness, tennis, baseball, boxing, golf, etc. Perfect gift: exercise ball, small and light, easy to carry and fits in your purse. You can use it anytime anywhere. This is a perfect exercise tool for men, women and children regardless of their age and gender. Anti-stress balls for strengthening: The anti-stress balls support you in addition to training resilience and the development of dexterity in order to reduce stress. If you are active in sports, you know how important the function of our hands is. That is why it is necessary to prepare your hands for a tough workout, just like with our back. Warming up the hands improves grip strength and increases the mobility of fingers and hands. Finger trainer is an indispensable Product s Finger trainer hand trainer set-3packs Therapeutic purposes: The hand training set is an ideal training set to improve overall grip strength, improve finger flexibility, prevent stiffness, relieve joint pain, while promoting blood circulation to the hand and preventing an imbalance in the muscles of a single finger due to excessive use. Tension prevents your flexibility and relieves pain. Especially with rheumatism, where inflammation occurs in the joint, it is recommended to move the hand gently and inward in a controlled manner. Stress Relief and Hand Exercise: The colorful ball has three areas (yellow 30 pounds-red 50Pound blue 60 pounds). Three different degrees of hardness of the grip balls give you the opportunity to continuously increase your forearm training or hand training. The muscle building is thus favored and you have a successful change in training. Portable and practical: Mini balls, light and small, these balls are practical for you and you can always exercise with your hand. When walking, traveling (car, plane, bus), office, school, watching TV orany other place you want to train. Technical data: Color and range: red 30 lbs, yellow 50 lbs, blue 60 lbs. Material: TPR. Product contains: 3 x hand exercisers Size: 2.2 inches x 1.75 incl