50 PCS Children Calligraphy Posture Correction Grip Pen AAtifact Silicone Three-Finger Pencil Case Random Colour Delivery

1. Material: silicone
2. With food designated position, thumb positioning, middle designated position, correct pen holding posture
3. Strong toughness, not easy to deform
4. Middle finger buckle design, only 1.2 cm thick
5. Size: about 5.5x4 cm
6. Weight: about 10 grams