Aurifil's 40wt 3ply thread is made specifically to handle the rigor of today’s high-speed, high-tech Longarm machines. All the versatility and lustrous color of the original 40wt, with the added benefit of extra strength. Perfect for longarm quilting, but is also a star for garment sewing, bag-making, domestic machine sewing, and more. 100% Extra-long staple Egyptian cotton. 

Needle Recommendations: 90/14 or 100/16 Topstitching Needle (50wt or 40wt in the bobbin), 4.0 or 4.5 Longarm Needle (50wt or 40wt in the bobbin)