Designed for: The Schmetz universal machine needles are designed to be used for most woven, and knits while the denim needles designed to be used on heavy fabrics. They are made using quality high carbon steel wire. This makes them remarkably strong, and hard to break. They will also not corrode or rust for a very long time. Compatible with: These sewing machine needles use the 130/705 H system, which is compatible with most home sewing machines, including Brother, Baby Lock, Bernette, Bernina, Elna, EuroPro, Husqvarna/Viking, Janome, Juki, Kenmore, N, New Home, Pfaff, Simplicity, Singer, and White. Shank: The Schmetz sewing machine needles come with flat shanks, which make them fit more easily into your machine, ensuring the perfect stitch every time. Tip: Jeans needles tip: they feature a modified medium ballpoint as well as a reinforced blade. This creates a sharp point that is specially designed to pass through several layers of denim without damaging the fabric. Universal needles tip: they have a slightly rounded point that is designed to prevent shredding and breakage. Eye: Denim: the needles have slender eyes that hold the thread in place for proper loop formation. Universal: the eye is large enough to comfortably fit most small to medium threads. Fabric use: Denim: Jeans, Denim, Canva, Quilt, Twill and, other densely woven material Universal: Bed-linen, brocade, double-face woven, cotton, felt, flannel, fleece, fun fur, thin leather, nylon, polyester, seersucker, thermovelour fleece, velour, velvet, wool, wool blends, woven, and knits The Apartment ABC universal and denim sewing machine needles variety package includes: Schmetz (4x70/10, 4x80/12, 2x90/14) universal sewing machine needles Schmetz (2x90/14, 2x100/16, 1x110/18) denim sewing machine needles