yarn-paradise website says:

“Weight : 50 gr. each skein. 400 gr. Each package
Length : 100 m. each skein. 800 m. Each package
Fiber Content : 70% Cotton, 30% Linen
Needle Size : 4 mm / US 6
Yarn Thickness : 3 Light: DK, Light, Worsted
Washing Instructions : Hand Wash at 30ºC / 86ºF, lay flat to dry.”