Connecting Threads 100% Cotton Thread Sets - 1200 Yard Spools (Over The Rainbow) 10 spools - Size 50/3, 100% Cotton, 1200 yards each Includes a bright, bold rainbow of primary colors in red, orange, yellow, green, blue, violet with a bonus pink Extra-long staple cotton, which produces a smoother thread with less lint Satin Finish--Mercerized for a stronger, more lustrous finish Fits standard sewing machine spindles