Nomad Design Madmacs Sinking High Speed Trolling Baits are capable of being trolled at speeds of up to 20kn for the 6" - 8" models and up to 15kn for the 10" models. All Madmacs can also be trolled as slow as 5kn and has an amazing vibrating action even at very low speeds due to the Autotune system. The Madmacs feature the patent pending Autotune system which allows it to always troll straight and to run perfectly and with an amazing action at a huge range of speeds. The ability to troll at all speeds makes this a must have lure in every spread.