... . Key Specification-Materials: iron, PP, PVC,foam-easy to assamble-Designed for efficient sit-ups, abdominal work and ... :1.Material compostion:steel,plastic or foam.2.Easy to use,no matter what fitness level.3.Four or ... will be back automatically.5.Use your strength of belly and waist to let it down,you will ... seated postion.9.Total core will help you to get fit with ease and happiness.PACKING DETAILS ...