(1) the cartridge material: use the k18, with the nickel 70% to 85%.Then can bear 790 anti-temperaure centigrade. (2) the seal ring in the cartridge, pls use imported ring, then can wear-resisting, good sealing, small oil spilling risk. (3) the shaft pls though the heat threating process, then can make accurate numerical. (4) for the shaft, can use the 42crmo, then the increase of the rare element can makes the turbo, more wear-resistant, and high-temperature. (5) every turbos, before delivery from factory, should pass the shaft and wheel testing, compressor testing, and whole balancing testing. 1.Neutral packing or the package as requirement. 2.One turbo in a carton. 3.Wooden case is a good choice for ocean shipping.