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1. No defects such as pits, ripples, discoloration, distortion, welding scars, peeling and cracking can be found on the surface of parts.
2. There was no obvious irritant odor at 80 degree C.
3. The trumpet board should be the same color as the main body, and the trumpet keys should be light, sensitive and even with the main body clearance;
4. Grease is needed on splines.
5. Cover performance according to enterprise standard Q/HFLB 02-2014 requirements;
6. The hardness of PU foam layer is HL75 +5.
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