Tajima CR401S Chalk-Rite Dura Chalk Box with 1 mm Chalk Snap LineTajima CR401S Description Extra heavy duty chalk box with an integrated handle release, premium braided nylon polyester line and matching felt applicator, a wide fill neck, and an integrated case gasket non slip grip. Tajima CR401S Includes (1) Chalk Box Tajima CR401S Features Premium braided line creates an Extra Bold 0. 04 in ( 1. 0 mm ) line Heavy duty aluminum case integrated with non slip grip surface Large gasket sealed refill port Double speed