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