Organ Leather Needles have a sharpened cutting tip, which is suitable for sewing with all types of leather. This pack contains three 90 sized needles and two 100 sized needles. When sewing with fiber-reinforced materials, the puncture hole sometimes gets too small. The unique cutting tip of this needle produces evenly shaped puncture holes. Favorite Uses: Great assortment for sewing on any kind of leather; and for threads from 60 wt. (light) to 30 wt. (heavier)