These needles are a great general purpose needle for densely woven materials! Needles penetrate extra thick wovens such as denims and leather, with a reduced risk of needle breakage or skipped stitches. Add to your stash for the next time you need a heavy duty, reliable pack of needles! Jeans/Denim Sewing Machine Needles, sold in a box of 100, size 80/12, from Schmetz.