Troyarn Wool 125 yarn is made of 100% Superwash Merino Wool Light Worsted Each Weight: 1.76 oz (50 gr) ; Length: 125 yds (115 m) Suitable for needle size Needle Size: 5- 5.5 mm, 6 - 5 UK, 8 - 9 US or Crochet Size: 6 mm, 4 UK, J-10 US. Merino wool comes from a specific breed, namely the Merino sheep which produces the finest, thinnest fibers in the world, about 1/3 the diameter of a human hair follicle, making it a superior fiber that is used in high-quality apparel manufacturing This fine hand, softness, and multiple natural characteristics make it the ultimate performance fiber that appeals to an active and eco-conscience customer Because of this, we like to call it the "wonder yarn!". Superwash Merino wool is machine washable and less prone to shrinking This features provides "superwashing," This involves treating wool fibers to make them more resistant to shrinkage and felting. Superwash Merino wool is popular for use in clothing, blankets and other household items because it is soft, warm and easy to care for. Eco-Friendly Choice: Choose Troyarn Wool 125 with confidence, as it proudly carries the STANDARD 100 by OEKO-TEX certification, guaranteeing a crafting experience that's kind to both you and the planet.