COATS & CLARK S950-2250 Dual Duty XP Heavy Thread, 125 Yards-Red Spool features the dual-trap system for a more secure storage without the spool unwinding Recommended needles: Machine: 9(65) Hand: sizes 9 and 10 his extra performance thread is ideal for lingerie bridal/formal fashions Bastiste chiffon nylon tricot organza voile as well as other sheer fabrics