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Quality of A GRADE:
1. Board grain: The grain of board surface and radial slice is flat.The space between annual ring is close. (about 4 in 10 mm)promit straight grain, no diagonal and bend;
2. Board color: request consistent,in general be buff,cann’t be white side;
3. Board bug: no permit bug, knurr, blet, craze, black line, oil line and so on;
4. No permit to have material of gravitation;
5. Board is calm,cleanness,no bend and distortion;
6. The spec of Thinkness: 34/36.
Quanlity of B GRADE:
1. The grain of board surface and radial slice is flat.The space between annual ring is sparse.(there is 3 grain in 10 mm) promit diagonal and bend grain;
2. Board color: the chromatism is no limitative,promit white side;
3. Board no knurr, no eat by insect, blet, promit less black line(about 3 line in one board, the longth is about 50 mm).
4. It is flat, no bend, no distortion.
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