THREAD SPOOL: Features one 109 yard spool of Superior Threads Tire Silk #50 thread made from 3 plies of filament silk 100% SILK: Tire Silk #50 is a 3-ply silk thread with a naturally bright and bold luster SMOOTH FINISH: Designed for quilting and general sewing, Tire Silk #50 has an extremely smooth finish PERFECT FOR CRAFTING: Tire Silk #50 is reccommended for applications where the thread is meant to blend more than to be the focus MACHINE USAGE: Ideal for all types of longarm quilting and home sewing machines