Amazon.com: TEX 270 Poly Sewing Thread, Black 16oz, Heavy Weight Thread typically Used for Sewing Heavy-Duty Leather, Upholstery Fabric, Canvas, and auto seat & interiors. Free with One Piece 5" Seam Ripper.
Thread Sizes: Ticket Number of Sewing Thread - Textile Apex
Thread size chart, Needle and thread, Sewing thread
Sewing thread sizes and how to choose
How to Measure Thread Size (Sewing Thread Guide) | AllFreeSewing.com