Extra Strong "Super" Magnum with 20"x20" Seat 25.10mm Steel Tubes The Trophy Angler Super Magnum 3 Leg Folding Chair features 25mm heavy-duty steel tubing and 600D double layer PVC non-crack fabric construction with powder coat paint finish. It measures 20" x 20" x 20" with a 20" seat. It comes complete with a carry bag with shoulder strap.