This I Love This Yarn Stripes is richly colored -- perfect for hats, scarves, shawls, sweaters, afghans and more. It is made of 97% acrylic and 3% viscose and is medium (4) worsted weight. Use with 5mm knitting needles (US 8 - UK 6) or crochet hook size 5 1/2mm (US I/9 - UK 5). Knitting tension is 18 sts x 24 rows = 4" (10 cm). Crochet tension is 12 sc x 15 rows = 4" (10 cm). Care instructions are machine wash warm, tumble dry. Do not bleach or iron. Dryclean with any solvent. Approximately 251 yards per ball.