Whoosh is 100% Mercerised Crochet Cotton used primarily in crochet but lends itself well to lace making, Spirelli and tatting. Fine crochet work looks particularly well in Whoosh. Currently a very popular medium, crochet can be used in all number of areas. Crochet jewellery, scarfs, table and wedding decorations, fashion accessories, hair pieces and so much more. A number 10 count yarn is also known as 10s or 10tkt (ticket) and is similar to 3 ply. Colourfast, 30°C Machine wash. Each ball is 366 meters approximately.