64 popular Solid Colors of Sulky 30 Wt. Cotton thread on 500 yd. spools. The perfect set of colors for any quilter. Sulky 30 Wt. Cotton thread is the ideal thread for hand and machine quilting, appliqué, embroidery and thread painting. This package is made even better because we send them to you in the Universal Slimline Box which is the perfect storage box for all of your Sulky threads. This is a great way to ensure you always have the perfect thread.