... that will look new, FOREVER. Tungsten rings have an amazing look to them, and are durable beyond any ... 4 times harder than Titanium. Tungsten measures between an 8 and 9 on the Mohs hardness scale ... various cementd carbide products and Tungsten carbide products. Such as cemented carbide rods , carbide strips, kinds ... rapidly and rigidly. Different grades are avaliable,such as K01,K10,K20,K30,P10,P20,P30 ...