This Irwin "Mach6" Reel and Chalk Combo has a 100-foot, high-tensile line that is ideal for rough, abrasive surfaces and is over double the strength of traditional chalk reel lines. The chalk reel features an aluminum housing with a metal drive gear for strength and durability. The back panel allows access for quick line changes, while the locking top makes refilling chalk easy. The 6:1 gear ratio rewinds the line 6 times faster than traditional chalk reels. This chalk reel includes a 4 oz. (113 g) bottle of blue chalk.