Tajima CR301JF Chalk-Rite Jam Free 5-Gear Chalk Snap Line Box, 100'Tajima Chalk Rite Jam Free smooth winding 5 gear chalk snap lines with gasket sealed die cast aluminum cases and braided 1. 0 mm extra bold lines. Elastomer wrapped body to ensure non slip use. End hook can be attached to a stay to eliminate catching on other objects. Larger chalk capacity for longer use between fillings. Patent pending jam free chalk box High quality Japanese design Positive locking, gasket sealed fill cap and extra wide fill neck