1. Material: silicone 2. Soft and high elasticity 3. The rules are simple and easy to understand 4. Small and portable, free to bring 5. Thick, no deformation after long time use 6. Applicable age: juvenile (7-14 years old) 7. Ability training: logical thinking, hands-on, brain-use, parent-child interaction, etc. 8. Size: 130x120x15mm 9. Unit weight: 48g
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