Large chalk line with extra strong cord that is ideal for demanding outdoor work. The housing is made from hard and durable Polystyrene plastic. Chalk is filled via a bottle attached directly to the Chalkline. The bottle is not included. The cotton absorbs the chalk, the polyester provides the strength. The braiding ensures that the line does not tangle. Additional information: *Model rrl 50 is a spare line. The bottle is not included.