The Hultafors Chalk Line comes with a cast powder-coated aluminium body with a sliding filler cover. The cord is braided cotton/polyester, the cotton absorbs the chalk while the polyester provides the strength, and the braid ensures the cord never tangles. The cord is 1 mm in diameter, and has a rupture limit of 16 Kg. 30m / 100ft. Capacity 80g of chalk.