The Mindful Collection Swivel Cords work with all types of Knitter's Pride needles and Tunisian crochet hooks. They are strong nylon-coated stainless steel to resist kinks while allowing your stitches to slide easily. The 360 degree swivel means your cables will not twist while knitting or crocheting. They are also marked at one inch intervals so you'll never have to worry about forgetting your tape measure. Each cord comes with 2 wooden end caps and 1 cord key.