Grade	Density	T.R.S	Hardness	Performance & application recommended
	g/cm3	Mpa	HRA
YM6	14.9	2100	90.0	Hard wood, original wood, aluminum section bar, brass rod and cast iron.
YM8	14.7	2400	89.5	Dry wood, soft wood, aluminum and brass, graphite and grass.
YM8C	14.7	2450	88.5	Soft and dry wood, general wood with loose knot, nan-made marble, ceramics and grass.
YM9C	14.4	2600	87.0	For debarking and cutting of frozen wood, soft wood and original wood.
YM11C	14.1	2200	90.5	Hard wood, non-ferrous metal, granite and marble.
YM15C	14.0	2700	86.5	For debarking and cutting of frozen wood, soft wood and original wood.