Superior's King Tut Quilting Thread is 100% EXTRA-Long Staple (ELS) Egyptian Cotton. Only a small percentage of Egyptian cotton is classified as Extra-Long Staple. This means the staple fibers are 10% longer than regular long staple cotton. That translates to LESS lint and MORE strength. Approx. 1 1/2" color change interval. The short change color intervals mean that the colors will flow beautifully through your quilt. King Tut is a #40 w100% ELS (EXTRA-Long Staple Egyptian cotton). It is perfectly suited for hand quilting, machine quilting AND especially wonderful for longarm quilting. 500 Yard Spool.