Extra Strong Thread : Sullivans International

300m - Strong nylon thread for leather stitching - TEX70 / CBB69 - various colors

Extra Strong Polyester Upholstery Thread 100m - Royal Blue - 724032-214

Gutermann Extra Strong Thread 110yd

Gutermann 27090038 Extra Strong Thread 110 Yards-Black

Leather Sewing Thread, Multiple Colour Hand Stitching Thread Strong Thread Sturdy Colorful Leather Thread for Mother for Leather Shoes(Off-white)

Gutermann Extra-Strong thread, Col. 448 (tan) - Sew Irish

GÜTERMANN Extra Strong Thread 100m - Rail Grey (Col. 701)

Gutermann Extra Strong 12wt Polyester Thread – Red Rock Threads

Threads - Official Lagartun Professional Fly Tying Products

GÜTERMANN Extra Strong Thread 100m – Fabricville