Create two perfectly aligned rows of topstitching with a twin needle. The universal point works well for most knits and wovens.
How to choose machine needles:
Choose your needle TYPE based on your fabric type; woven, knit, silk, denim, leather, etc.
Choose your needle SIZE based on your fabric weight; a smaller number for finer fabrics and a larger number for heavier fabrics.
The standard size shank will fit into nearly every machine.