Mercerised cotton for extra strength and durability. More lustrous than conventional cotton, it also may not shrink or lose its shape as much as "regular" cotton. 100g ball measures approximately: (l) 530m. Suitable for crochet hook sizes 1.5-1.75. Perfect for crochet, knitting, embroidery, cross-stitching, needlework, friendship bracelets and other crafts. This could also be used as a warp thread for weaving due to its strength and durability. Washable at 60 degrees. Do not bleach. Iron on medium heat.