WYS Bluefaced Leicester DK -yarn is 100% Bluefaced Leicester wool. The recommended needle size is 4. Machine washable - gentle treatment. West Yorkshire Spinners (WYS) is based in the county of West Yorkshire which is the original home of the British Worsted Spinning industry. WYS have been working with Novita of Finland for decades, sourcing the finest raw materials, sharing technical knowledge and working together developing truly unique and inventive products.