IRWIN Tools STRAIT-LINE 2031314DS MACH6 6X High-Speed Refillable Chalk Line Reel, 100-foot (2031314DS) Chalk line marker has 6:1 gear ratio retracts 6 times faster than traditional chalk reels. Durable metal drive gear. Incredibly tough nylon/polyester braided line. Wide pronged metal hook clips easily to belts and rigs. Aluminum case and metal handle. Retractable self-locking metal handle allows reel to be used as a plumb bob. Refillable case holds approximately 2 ounces of marking chalk (not included).