Necessities House Collection - 4 Large Spools, 50wt, color# 2000, 2021, 2600, 2692. Aurifil’s 50wt/2ply thread is Aurifil's most versatile and most popular cotton thread. It is wound on their iconic orange spool. The 50wt is strong and thin, and results in remarkably flat and crisp seams. While it is wonderful for piecing, subtle quilting & topstitching, and English Paper Piecing it also works incredibly well for Needle Turn Applique, Bobbin and Machine Lace, Machine Applique (Straight Stitch, ZigZag, Blind Hem and Blanket Stitch,) Machine Embroidery, Dense Machine Quilting, Subtle Machine and Longarm Quilting, Basting, Whole Cloth & Micro Quilting, and Dense Background Designs.