Product Description: Longpu solar vacuum tube adopts interference solar absorption layer and unique three-target magnetron sputtering coating technology.Even at high temperatures of 400 degrees,the metal ions in the film will not be lost,and its strong endurance greatly prolongs its life. Features: 1 Outer Diameter of tube : 125mm,137mm 2 Thickness of tube: 3.0mm 3 Length of tube : 566/600/700/850/1860/2160mm 4 Application:solar cooker,solar water heater ,solar collector. The tube size can be customized according to customers. the tube can be used for solar cooker, tankless solar water heater, indoor heating, and solar collector on residential, commercial and industrial. For air shipment,cartons are mostly used . For sea shipment,only cartons are used if it's a full container. If it's a FCL ,we will use cartons+ wooden case according to the order.