Hayfield Bonus Aran, produced by Sirdar, is a fantastic value 80% premium acrylic and 20% wool blend Aran weight yarn in a dazzling array of shades. Each ball ways 400g giving you 850m of length with a tension of 18sts per 10cm. we would recommend using 5mm needles and washing any garment at by machine, please do not tumble dry this yarn.