The Tornado worm is constructed in a manner, to which it has an action like no other soft plastic worm on the market. Hag's Tornados have a built-in rattle chamber in the tail so that the fishermen can easily insert a rattle without damaging the worm. This rattle chamber can be left empty and it will create an air pocket that will add extra buoyancy to the tail. When rigged on a Texas rig, the worm will stand completely vertical. When rigged on a Carolina rig, the worm will float off of the bottom. This will be deadly when fishing those deep grass beds or trees. Put it on a shakey head and watch out! Hag has used a special formula on his plastic that not only allows the worm to stand straight up and down or even float off of the bottom, but also makes it tough enough to hold up to all those fish you catch. A lot of competitor's products tear up with only one fish, costing the fishermen a lot of money. These worms are tough and you will love not having to put a new worm on each time you catch a fish. The F4 series is 4" long, F5 series is 5", F6.5 series is 6.5, F8 series is an impressive 8" long. 8 Tornado's per pack!