COATS&CLARK-Extra Strong & Upholstery Thread. Upholstery Nylon is a heavyweight 100% nylon thread for machine and hand sewing indoor and outdoor heavyweight fabrics. For best results use a size 18 needle and increase stitch length. This package contains one 150yd/137m snap spool of thread. Available in a variety of colors: each sold separately. Imported.- The upholstery needles is used for tying springs to webbing, sewing edges and stitching through padding. The upholstery needles is used for tufting, attaching buttons and anchoring spring bottoms to webbing. Great for weaving. Includes 6-Inch, 8-Inch, 10-Inch and 12-Inch 4 needles per pack.