Klasse' Leather Needles Size 100/16 5 German-Engineered Steel Machine Needles This needle type is for geniune leather. The chisel point penetrates into difficult to sew projects. Do not use this needle with textiles or synthetic suede or leather. With a unique curved design at the clearance-above-the-eye "CAE" stress point distributes pressure equally which makes Klasse needles much stronger then other flat conventional needles