Standard Durability: These needles should be replaced after 5-6 hours of actual sewing or embroidery time. Standard Eye: The standard eye can be used with 40 weight or lighter polyester embroidery thread or with 40 weight or lighter sewing or quilting thread ( cotton or polyester). Not recommended for metallics. Size: A size 80/12 needle is appropriate for medium to heavy weight fabrics. Type: The sharp tip of the needle pierces woven fibers for a perfect stitch. Use: This needle is perfect for medium to heavyweight wovens like chambray, trigger, or similar fabrics. Quantity: 10 needles per package