These are needles that are designed to be used as nalbinding tools but they could probably reasonably work for darning, weaving, or whatever else you'd use something else like this for. There are four sizes--3 inch, 4 inch, 5 inch, and 6 inch. The included photos show the 3, 4, and 5 inch needles. Unfortunately my printer is a bit too small to print the 6-inch needle but I thought I'd include it just in case. I recommend using supports for any of the needles larger than 3 inches and then just smoothing them down after printing. I ran into issues on the 4- and 5-inch needles around the eye where the layers werent making contact with the platform and adding supports fixed it.