When the Game is On the Line! Make your mark on the playing field with this compact & portable chalk line marker. Easily lay down the lines of any playing field, effectively and affordably. The specially designed wheel system will keep track of the distance as you walk. Simply snap the tube holder together and insert the spray chalk canister. Then roll the Chalk Line Express while squeezing the trigger for an even, steady application. Have a field day with Chalk Line Express! Includes Chalk Line Express Chalk Liner, Chalk Liner spray chalk, booklet of official playing field measurements and instructions.