Standard Durability: These needles should be replaced after 5-6 hours of actual sewing or embroidery time.Large Embroidery Eye: The large embroidery eye prevents thread breakage and fraying. Use with 40 weight or heavier embroidery thread. Works well for metallics.Size: A size 90/14 needle is appropriate for heavy weight fabrics.Type: The ballpoint tip of the needle pushes the knit fiber to the side with each stitch instead of piercing it. This prevents breakage of the fibers which lead to small