KLASSE jeans machine needles are engineered with a very sharp point and a reinforced shaft to pierce dense, tightly woven fabrics cleanly. This cassette includes five size 100/16 needles for denim, canvas, and heavy twills where thick seams demand confident penetration. Use them for workwear sewing, sturdy bags, and repairs on heavy fabrics, and switch to a lighter needle once you move back to thinner materials.