Cutex Bonded Nylon Sewing Thread. This is a high quality heavy duty sewing thread ideal for sewing a wide range of products. BNT Nylon provides superior sewability plus good abrasion resistance and seam strength. Bonded Nylon Thread is the popular choice to use when stitching upholstery, leather, vinyl and other heavy fabric. Tex size 135 (BNT 138) High bond quality and consistent diameter Good seam strength Available in a variety of colors Spool weight 8.8 oz. 1500 yards Recommended needle size: 21 to 23 attach elastic tape to stretch fabric Color note : Actual colors may vary slightly due to computer display settings.