1. Foam: duck feather grade C2. Holder: duplex table fiber3. Water duck feather, thick wool, dense fiber4. Tight and firm coil, good toughness5. Inorganic glue with strong molding effect, the ball frame is not easy to fall apart6. The thick feather bone is durable and not easy to break7. Three replaceable balls in one bucket8. Size: 15.2 x 7.5cm9. Weight: 66g/bucket