These rings are slid on to the knitting needles to use as a guide for increasing and decreasing a stitch. Also for marking in the beginning and ending of a stitch pattern. Package includes Small (10pcs) and Large (10pcs) rings.
For needle sizes
Small: No. 11 (8mm) to No. 15 (10mm)
Large: No. 17 (12.75mm) to No. 35 (19mm)