Ring Markers to slip on your knitting needle when you need to keep track of stitches in a pattern. Includes 20 pieces: 10 small (US 11-15) and 10 large (US 17-35) The round stitch ring markers come in small and large sizes. The rings are inserted onto the knitting needles to mark as a guife to increasing and decreasing a stitch. Also for marking in the beginning and ending of the stitch.