The length of crack must be under 300mm, width under 2mm. any other objection, including the worm hole, molder and unnature various colour are not allowed.

• 活节不限；死节直径在50mm以内；开裂长度在300mm以内；宽度在2mm以内.；不允许有虫孔；腐朽以及非自然色差。