The tungsten carbide buttons are manufactured from our premium virgin grade. A tungsten carbide and cobalt combination that allow the highest wear resistance and fracture toughness possible in most application. Our heat treating process has been perfected to maintain carbon control and porosity, helping to eliminate premature breakage and wear If you are interested , kindly please contact me as following: Principal: Jack Mail Address: jackhuang84[ at] 126.com MSN: seamind[ at] live.cn Mobile: 86-015292202012 Fix Phone: 86-731-28838869 Website: www.china-oed.com