Advantage - Allows you to track row, stitch and pattern counts and number of sts, which helps you through any project. How to work - Slips onto needle, you can track number of sts, and then the rows already worked. Material - plastic, Color: red and blue. Small size - 0.83" x 0.51"/ 2.1cmx 1.3cm. large size: 0.87" x 0.63"/2.2cm x 1.6cm. Fit for - Great for circular and double point knitting slips onto needle. 10 Pcs 2 Sizes Plastic Knit Counter Knitting Crochet Stitch Marker Row Counter for Recording The Number of Weaving Rows - 5 Large and 5 Small