These Singer Twin Universal Needles can be used for stitching two closely spaced parallel rows at a time – perfect for decorative stitching! The needles are ideal for use with medium woven fabrics. Made from high-quality steel, these lasting needles will make a great addition to your sewing collection. There are two twin machine needles included in the pack, both size 90 with 3mm space between needles. Strong, efficient and reliable, these needles are ideal for completing a wide range of projects. Use them time and time again to sew your best designs yet! They are compatible with the following Singer sewing machines:- M2105, Confidence 7640, Patchwork Plus C5985Q and Heavy Duty 4423