. for micro fiber fabrics and silk Suitable machines. Sewing machines, BERNINA 8 Series, BERNINA 7 Series, BERNINA 5 Series, BERNINA 5 Series (before 2017), BERNINA artista, BERNINA activa, BERNINA 4 Series, BERNINA 3 Series, BERNINA 3 Series, BERNINA 2 Series, BERNINA Classic Series. Suitable material. Woven fabrics (light, medium and heavy-weight), Plastic. Suitable projects. General Sewing, Sewing on buttons and buttonholes, Zippers, Hems and topstitching, Decorative sewing, Materials that tend to stick. Needle size NM. 90/14 (5 pack).