1. Material: PU 2. Process: machine stitch 3. Applicable age: No. 7 is suitable for adults 4. Size: No. 7: Diameter is about 24.2 cm 5. The leather is soft and delicate without hurting your hands 6. Sealed inner tank, wear-resistant and resistant to beating 7. Precise engraving, good airtightness 8. Note: Delivery is not inflated, please purchase inflation tools by yourself