1. Material: plastic 2. Applicable people: unlimited 3. Applicable age: over 3 years old 4. Weight: about 14g/piece 5. Size: about 8x4 cm/piece 6. Press the silicone button repeatedly to train finger flexibility 7. Soft silicone bubbles that can be easily pushed back and forth to relieve anxiety 8. Note: there is no pattern on the reverse side
