Our Colorado blades are designed for open water trolling.  Size #6 Colorado are some of the larger harness blades for walleye fishing.   Walleye in Erie, Green Bay, Lake Winnebago, and other large bodies of water will chase spinners a long way.  You need a blade that will get their attention trolling from 1.0-1.7 MPH with inline weights, bouncers, or jet divers.