Bouton d'or knitting yarn Surya Grappe is composed of 56% bamboo viscose and 45% soy with a slightly silky effect and is knit with 3 mm (US 3) knitting needles for a gauge of 38 stitches and 29 rows. A 50 gram (1.75 oz) ball contains about 156 metres (170 yards). Machine wash 30°C.