Big Mouth Chalk Box 100' Super high speed 3 X 1 gearing for rapid rewind. Our Patent-pending Chalk Catcher with Spring Cleaner minimizes chalk spray, reduces waste, and catches the chalk that used to end up on your clothes or on your layout. The patent-pending elliptical spool churns the chalk which improves string coating. Gear lock makes keeping a taut line a snap. Rugged crank handle with spinner for easy rewind.