WonderFil Tutti 50wt 1000yd Variegated Cotton Thread Spools. Egyptian cotton yarn, double gassed and mercerized to create a wonderfully soft, clean and lustrous finish. Free of waxes or coatings that can cause buildup on machines. Tutti is a super low lint yarn available in 41 pretty variegated colors. The double gassing process involves burning the fluff off the yarn twice, resulting in a much smoother, cleaner finish.