Ball Point (Style 2045) needles are used for sewing on knits; the rounded tip allows the needle to pass between the fabric threads by separating them.

Sheer to Lightweight Knits 80/11: Jersey, Single Knit, Spandex, Tricot

Medium to Heavy-weight Knits 90/14 or 100/16: Double Knit, Sweatshirt, Sweater Knit

(Using a regular point needle on knit fabric will result in skipped stitches and fabric damage, causing it to curl.)