ABC grade mixed , one side edged and ending crack allowed( A grade 30%~35%、B grade 30%~35%, C grade 30%~35%),without wooden heart.

该等级由去除芯材后的所有木材等级混合打包，允许单边直边，允许端裂。(A级占比30%~35%、B级和C级各占比30%~35%。)