Nylon 210D 2, 3, 4, 5, 6, 12, 15, 18, 21... Polyester 75D 3 150D 2, 3, 6, 9 250D 2, 3, 4, 6, 9 Polyester spun 20S 3, 4, 6, 8, 18 30S 3, 4, 6 40S 2, 3 50S 2, 3 60S 2, 3 Nylon6,6 210D 3, 6, 9