This Tajima Chalk Rite Jam Free chalk line features a smooth winding mechanism with an ABS case that prevents tangling on rewind. The jam-free reel allows for easy line extension and retraction. It has a bi-material construction with an ABS casing and a rubber grip for comfort and control. A viewing window allows you to check the chalk level, and it uses a braided 1mm extra bold line. The chalk line also features a large, easy-to-fill neck for chalk refills. Additional features include a premium grade 1.0mm braided nylon/polyester line with a matching felt applicator. It has a positive locking, gasket-sealed fill cap and an extra-wide fill neck. The thumb-actuated line lock holds the line and releases automatically during rewind. A thick elastomer cover protects the case and ensures non-slip performance, while a new felt gear case gasket protects gears from abrasive chalk. The sure-grip elastomer-wrapped end hook and end hook stay help prevent tangles. A new stainless steel pin reduces friction and increases line life. The folding crank and 5-gear fast wind ensure smooth, dependable rewinds. This model is redesigned with a patented 'Jam Free' system and has a greater chalk capacity of 3.5 oz.