Designed and Engineered in Germany the Klasse Steel Machine Needles, boost being backed by 125 years of expertise and technology. Constructed with a slight ball point the Universal Needle makes it exceptionally adaptable with the ability to work on a large variety of fabrics, materials, and most sewing machines. Despite the versatility of this needle it most suited for woven and natural fibers. The larger universal needle sizes can be used on medium to heavy weight fabrics. For best results use with polyester, 100% cotton, or polyester/cotton blends.