... Key Specification-Materials: iron, PP, PVC,foam-easy to assamble-Designed for efficient sit-ups, abdominal work and ... .Material compostion:steel,plastic or foam.2.Easy to use,no matter what fitness level.3.Four ... Use your strength of belly and waist to let it down,you will have a excellent belly.6. ... comfortable seated postion.9.Total core will help you to get fit with ease and happiness.PACKING DETAILS: ...