materials 1.the case is made of high strength anti-rust alloy aluminum, and the surface is die cast aluminum , polyester epoxy powder coasted. 2.use silica gel to airproof. 3.stainless steel safety agraffe. 4.porcelain lamp holder:e27.e40 and b22. 5.the transparent cover is made of pc. special features 1.applicable for different lighting source. easy dismantle and maintenance. 2.the transparent cover is anti-static , with a anti-drop string. 3.light weighted ,vibrate-proof, wind-proof, high intensity. 4.applicable for standard gears, whose outer diameter is 42mm to 60 mm. 5.protection grade:ip65.