COATS: YARN-Red Heart Vivid Yarn. Vivid yarn comes in trendy neon shades that are perfect to use to create accessories that can"t be missed. Weight category: 6: 100-percent acrylic 5oz/141g 50yd/45m. Gauge: 6stx9r = 4in/10cm on size US 19 knitting needles. Suggest crochet hook size Q. Care: machine wash cold in gentle cycle tumble dry low do not iron. Imported.