The All-Terrain Tackle - Rock Jig is Tournament Football Head is designed to help it travel through rocks and gravel, over ledges and through other hard bottom areas without getting hung-up. Designed to be fished with Hula Grubs. Twin Tail and other crawfish style trailers. The Terrain Tread on the underside of the jig actually grips the bottom allows you to feel the bottom composition better than ever before.