Builders line is designed for marking long straight lines along relatively flat surfaces. The OX Cyan Nylon Brick line Box is an ultra strong brickline that's tightly braided for optimal strength and coloured in OX blue for maximum visibility. Enjoy better visibility with its signature colour. The OX Pro Ultra Tough Nylon Braided Builders Line Cyan -105m Features: Ultra tough braided nylon brickline Cyan colour for high visibility About... The OX Pro Tough Nylon Braided Builders Line is is an ultra tough nylon brickline that's tightly braided for optimal strength. Enjoy better visibility with its signature cyan colour.PTDOXGOXP104210