타입 텅스텐% 코발트% 입자크기 항절력(T.R.S.) 밀도[g/cm] 경도(HRA) ISO계열
A 90 10 0.6 3600 14.5 91.9 K30-K40
B 88 12 0.4 3800 14.1 92.3 K40-K50
C 86.65 13 0.4 3900 13.9 92.4 K40-K50
D 89.8 9 0.2 4000 14.3 94.4