COATS & CLARK S950-8010 Dual Duty XP Heavy Thread, 125-Yard, Natural 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 Batiste chiffon nylon tricot organza voile as well as other sheer fabrics