Mettler Seralene Polyester Thread, 2187 yd/2000m, White Seralene is the most used thread in the industrial market for small letter and motif embroidery You get great definition and clean edges on your small embroidery projects when you use Seralene Manufacturer recommends a 65-70 needle size Seralene is perfect for creating fine, almost invisible seams on lightweight fabrics and when using as a serger thread you will get virtually invisible seams with exceptional smooth characteristics and strength Thanks to its fine qualities, Seralene can also be used as bobbin thread