已经有次观看 wencong在2013-07-05发布

Channel：Tungsten 标签： Tungsten,Tungsten  gold  ring,Tungsten  carbide  rings 

简介：Tungsten carbide alloy full name, also known as tungsten steel industry. Tungsten is the world's one of the hardest metals, hardness 8-9M (Mohs hardness standard) between second only to diamonds.