✅ CONSISTS OF TWO SHAPES AND THREE KINDS OF RESISTANCE: This set contains 1pcs yellow soft ball, 1pcs red medium ball, 1pcs purple medium ball, and 1pcs blue hard ball, which is egg shape and round shape. You can practice in the order of hardness size. ✅ MADE FROM ENVIRONMENTALLY-FRIENDLY TPR MATERIALS: The environmental material gives you a good feel and no odor when using this hand squeeze stress ball. Easy to clean, flexible and no deformation. ✅ 4-PCS SET: With this four-pack exercise squeeze ball you can get more training methods, plus, people with large palms can use four balls to exercise together, solving the traditional one or two ball training defects. ✅ SMALL AND EXQUISITE TO CARRY: You can use the small and light ball to exercise at any time, in the office, at home, on the road etc. After used, put it in the carry bag, not occupy your space. ✅ EFFECTIVE TRAINING TOOL: This grip ball not only strengthen your finger, arm, wrist efficiently but sometimes it works to relieve stress. KELYDI Exercise Hand Squeeze Stress Balls with Carry Bag 3 Different Resistance Grip Strengthening Finger Wrist Exercise and Therapy 4 Pack - WMMYRP2M