These Singer sewing machine needles are precision manufactured and colour coded for easy identification. In a standard point size 70, use them for lighter weight, natural, woven fabrics. 
Suitable for the following materials:
Sheer to lightweight: Batiste, Chiffon, Georgette, Organza, Voile and all microfiber or microdenier fabrics.
Lightweight: Challis, Chambray, Charmeuse, Crepe de Chine, Gauze, Handkerchief Linen, Silk, Taffeta, Tissue Faille.