Klassé Sharps Needles. Size 70 5/pkg. The sharp point of this needle is designed for stitching tightly woven fabrics and is ideal to use with silk, microfibre and other synthetic fabrics. The sharp point will give you a perfect straight stitch, making it an ideal needle for topstitching, and patchwork. The finer needles such as size 60 must be used with a very fine thread such as size 60 & 80.