KLASSE sharps sewing machine needles are intended for detailed work on fine, tightly woven materials and precise seams. This cassette includes 5-pack in sizes 60/8, 70/10, 80/12 so you can match needle size to lightweight through medium-weight fabrics. Choose the size that suits your fabric and thread, and change the needle when it dulls to help reduce puckering and pulls for consistent results across your sewing routine.