Item no:TPH24B/CK-2SC107(2 section) Item no:TPH24B/CK-3SC101(3 section) BY USING 6061 / 7075 ALUMINUM ALLOY OR CARBON METAL OR FIBERGLASS MATERIAL. WE ALSO INCORPORATE FOLDABLE & EXTENDABLE ANTI-SHOCK SPRINGS INTO OUR PRODUCTS,MAKING THEM IDEAL FOR MOUNTAIN CLIMBING,HIKING / TREKKING IN ICY CONDITION OR LIGHT HIKING,GREAT FOR MOUNTAINEERS AND CLIMBERS.ALSO GOOD FOR HIKER.