RED HEART comfort yarn is a size 4 medium worsted yarn that comes in a huge color range so that you can find the perfect shade for your perfect crafting project. These balls are much larger so they are great to tackle throws and other larger projects - solids are 867 yards in length and multi are 649 yards in length. These are no dye lot solids! we recommend a size us 7 knitting needle and a size i-9 crochet hook. Please machine wash on warm, gentle cycle; tumble dry on low to keep your projects looking great