10 Colors Waxed Thread, Colorful Leather Sewing Thread, 55 Yards Per Color

Strong and Durable: The sewing thread is ultra durable and super strong for leather work, beadwork, and bookbinding.150D waxed leather thread, Lightweight, portable, strong and durable to use. The leather waxed thread cord made of good quality material and is duty and wax coated, so it makes tightening the stitches very easy.

eBay