Also pegs made of jade are not auspicious, moreover they are heavy. If a string breaks, they may fall on the ground and be broken. Sandlewood is suitable here. Some use cattle, or ram, or rhinoceros horn. If one should use ivory, beware of it cracking.
Boxwood gets dirty after a while.
As for the hui, it is best to use oyster shell. They should be bright, beautiful, and elegant to behold. Under the light of the glistening moon, the hui will be brilliant. Some use gold, but this is not auspicious for the ch'in. One may be inviting thieves to dig it out and harm the face of the ch'in.