1. Seat post material: aluminum alloy, seat bag material: PU 2. No punching 3. Quick release installation 4. Shock-absorbing elastic seat 5. Adjustable width 6. Comfortable hollow rear seat design 7. Suitable for 13.5-14.5cm pedal 8. Both 5.5 inch and 6 inch scooters can be installed 9. Seat bag size: 16x26cm 10. Adjustable height: 40-60cm 11. Weight: 1.62kg