Model Number: JC-01 Material: Aluminum Model Number: JC-31 Material: Aluminum+Plastic+Rivet Model Number: JC-02 Material: Plastic Model Number: JC-33 Type:Adjustable Hinge Knee Brace Material: Aluminum+Plastic+Rivet Model Number: JC-07 Material: Aluminum Model Number: JC-03 Material: Aluminum+Plastic Model Number: JC-05 Material: Aluminum+PVC Cover Model Number: JC-06 Material: Aluminum Model Number: JC-08 Material: Iron