Color classification:

Style 1: 300mm bracket 2 * 3 characters

Style 2: 300mm bracket 2 * 4-shaped grain

Style 3: 400mm bracket 2 * 3 word grain

Style 4: 400mm bracket 2 * 4-shaped grain

Style 5: 500mm bracket 2 * 3 characters

Style 6: 500mm bracket 2 * 4-shaped grain