Fingering, Sock, Baby... included in group 1, according to the Standard Yarn Weight System that classifies yarns by weight. Fingering yarns are fine yarns most commonly used to make socks, shawls, light sweaters, and baby garments. They are worked with 2-3.5-mm knitting needles or a 2.5-4-mm crochet hook. One ball of 100 grams of (4 ply) Fingering weight yarn can consist of between 350-425 meters. These fine yarns usually have a WPI (Wraps per Inch) of 17-21.