1 inch regular fishing bobbers have proven to be effective. A bright color is also helpful at alerting any boaters of the cable in the water so it is not damaged by a passing boat. Floats kits can be purchased at http://www.hawkeyeelectronics.com/shop#!__shop/vstc10=parts-&-accessories . Look for Part# 3000-94 Portable fish Finder Mini Float Kit.
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