KLASSE jeans/denim needles are made for dense, tightly woven fabrics used in denim garments, workwear, and sturdy bags. This carded pack includes 5-pack in size 100/16 for handling heavier layers and frequent seam crossings. Use a suitable thread for heavy fabrics and replace the needle if it bends or dulls to help maintain clean topstitching for consistent results across your sewing routine for consistent results across your sewing routine.