Miscellaneous tubes/ tubing can be classified according to: Material: carbon steel tubing, low-alloy steel tubing, alloy steel tubing, stainless steel tubing, nickel alloy tubing, titanium tubing, aluminum tubing, copper tubing, zirconium tubing, special metal tubing, rubber tubing, plastic tubing, glass tubing. Application: pressure tubing, instrumentation tubing, hydraulic tubing, mechanical tubing, structural tubing, boiler tubing, superheater tubing, furnace tubing, heater tubing, …