The Singer Microtex (Sharp) style of needle has a thin accurate point that is ideal for sewing batiks. Designed to be used with micro fibres, polyester, silk, foils, artificial leather, and coated materials such as laminates, this style of needle also is perfect for piecing. They are compatible with the following Singer sewing machines:- M2105, Confidence 7640, Patchwork Plus C5985Q and Heavy Duty 4423