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% 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.