Twin needles are designed for practical and decorative sewing such as pin tucking, seam finishes, top stitching etc. Ballpoint needles are for sewing knitted fabrics, especially cotton knits.

Use at reduced speed 

Size - 75/11
Stitch gap - 2.5mm
Use - For heirloom sewing and decorative topstitiching.
Machines - Suits all modern machines; Bernina,Bernette, Brother, Elna, Husqvarna, Janome, New Home, Pfaff, Simplicity, Singer, Toyota, Viking ect.
Type - Pre-packaged, 1 needle in a pack