... use3.Stress free,Strain free workout New AD Rocket TwisterWith Twist Seat.GW:8KG NW:KG Four ... 47.5cm ,Key Specification-Materials: iron, PP, PVC,foam-easy to assamble-Designed for efficient sit-ups, abdominal work ... storage Product Description:1.Material compostion:steel,plastic or foam.2.Easy to use,no matter what fitness ... .Container Loading:750pcs/20'FT 1600pcs/40'HQ New design AB Coaster AD ROCKET