Due to size difference and easy breakage of nuts, the use of chute-type color sorters often cannot achieve a satisfactory performance, as the chute is designed according to the similar size and shape of raw material, for those materials with big size difference cannot be applied to go through correctly. Also because of the high drop height, it is easy to cause broken. SKY BM-DY series color utilize smooth and stable belt for material transmission, which not only reduces the collision of materials, but also protects materials from damage and no bounce. It is easy to identify the color difference with a much smaller carryover rate and high sorting accuracy.