The Pro Propellerô is a very controversial product! It is however a undesputed fact that the propeller are deadly to almost any specie of fish. It adds a second dimension to the attractor effect besides the visual. Propellers in various versions have been around for many years and hard core fishermen have known to the efect of it, but the quality of these have been quite poor. The Pro Propellerô is top quality in all aspects. Slide it onto the leader and see the results for your self!!