Heritage Solids are supersoft yet durable and machine washable and dryable because of the blend of Superwash Merino Wool and nylon. Heritage Has amazing stitch definition. 100g. 3.5 oz. 437 yards. Knitting Needle size 1-3 (2.25 – 3.25mm). Crochet hook size C – E (2.75 to 3.25 mm.) Machine wash cold. Tumble Dry low.