... FRP (Fiber Reinforced Plastics) Jointless Structure. Thermostable, oxidation resistance, and corrosion resistance. Other Brand:Wood plate, cannot bear heavy body, ... by human body, no authoritative approval.Bulb is consumable parts, hard to change/fix, large power consumption. 3. ... Drive SystemDriven by chain, strong, slip resistance. Other Brand:Steel wire, bad slip resistance, can not drive too much, ...