... , 12B-1, 16B-1, 20B-1, 24B-1, 28B-1, 32B-1, 40B-1, 48B-1, 56B-1, 64B-1,72B ... , 12B-2, 16B-2, 20B-2, 24B-2, 28B-2, 32B-2, 40B-2, 48B-2, 56B-2, 64B-2, 72B ... , 12B-3, 16B-3, 20B-3, 24B-3, 28B-3, 32B-3, 40B-3, 48B-3, 56B-3, 64B-3, 72B ... 8187 standards.Color: blue, black, yellow and natural industrial transmission chain (B series)