Irwin STRAIT-LINE MACH6 Series 1932890 Chalk Reel and Chalk Combo, 100 ft L Line, Black/White Line, 6:1 Gear RatioThe Irwin STRAIT LINE MACH6 chalk reel features an easy fill and lock top that provides a wide opening for increased speed and visibility when filling the reel or accessing internals. The top locks securely with a 1 4 turn to prevent unwanted spills. The 100 ft hi tensile line is 2. 5X stronger than traditional chalk reels for fewer breaks on rough, abrasive surfaces and the reel has a 6,1 gear ratio to rewind the line 6X faster than traditional chalk