This is for one (1) 3000yard spool of Rainbow Swirl Maxi Lock Polyester Thread. Decorative Spun Polyester. Mildew & UV light tolerant, shrink and abrasion resistant. Variegated - Multicolour - Rainbow. These threads are fantastic for everything knit! Swimwear will not fall apart with these threads and they are great on coverstitch machines and overlockers too!