Die-cast aluminum housing for durability. 2X stronger line – 3X line abrasion resistance. Rewinds 5X faster* – has a 5:1 gear ratio. Quick gear release – crank will not spin when pulling out line. Stainless steel hook and crank handle. On-board hook storage. ChalkView™ case – see amount of chalk inside case. Premium polymer string resists breakage and fraying.