These are the Jumbo version of CocoKnits' popular ring stitch markers. They are brightly colored and easily seen when marking rounds, increases, decreases, and stitch patterns. Made of nylon coated steel. Stitch markers accommodate up to US 19 needle. Included are 5 each of 6 bright colors to help you keep track of your knitting. When not in use, they attach to your Knitter's Keep or any magnetic base. Made of nylon coated steel.