This Schmetz quality needle is made especially for sewing through densely woven materials such as denim or imitation leather. This modified medium ball point and a reinforced blade makes this needle perfect for penetrating extra thick woven fabrics or quilts with minimum deflection and reduced risk of damaged fabric and skipped stitches. This advanced point design is a Schmetz exclusive. Some quilters use it when sewing through many layers of fabrics, especially high thread counts batiks. Choose the size based on the type of thread being used. The heavier jean threads work best with the larger needle.~