These very convenient row counters can be used with both thin needles and thicker knitting needles, ranging from size 15 to approximately 7mm. They come with number beads from 1 to 0, so when you reach the end of a row, you thread your knitting needle through the loop next to the number. By using an alpaca marker for the tens digit and attaching the ones digit to the knitting needle, it's easy to keep track of the number of rows you've knitted. This is a very convenient item. They are lightweight and won't be a burden. The number 9 is a different color, so you can easily distinguish between 6 and 9, allowing you to knit smoothly and clearly. This set includes 5 markers. The last three photos show example usage, and they can be used with needles from thin sizes up to approximately size 12.