Hand Muscle Exercise Pressure Brain Toy Funny Brain Stress M2N25229\n\nSuitable Size: each of brain stress balls are measures . 7 cm/ 2.76 inches long, proper size fits hold and grip, suitable for most teens and adults to play and bring people endless fun\nSufficient Quantity: you get 12 pieces of brain shaped stress balls, rich quantities to place them , , in your car or at school to release your stress at any time, and also perfect for exercising your hands and increasing your grip strength, muscle exercise, and more\nQuality Material: these fun stress balls for adults are made of quality polyurethane material, without any filling, not easy to break, fun to twist and stretch, good resilience, can be pressed repeatedly, and no irritating smell, suitable for all kinds of hand shapes, and can be applied for a long time\nStress and Anxiety Relief: these fun stress relief toys are perfect for relieving tension, stress or anxiety, by pressing on them, your emotions can be vented, andl