System 130/705 H-J: The medium ball point penetrates thick and solid fabrics easier without damaging the material. The reinforced blade causes less deflection of the needle and reduces the risk of breakage and skip stitches. For denim (jeans) and similar fabrics. Fabric Use: Denim and similar fabrics. Advanced point design is a SCHMETZ exclusive. For penetrating extra thick woven fabrics, denims, or quilts with minimum needle deflection, reduced risk of breakage and skipped stitches. Needle sizes: NM 70 to NM 110, also assorted. Choose the size based on the type of thread being used Colour coding: blue Also available as TWIN NEEDLE.