These polished steel propellers are designed to provide boaters an additional option between Standard Black Steel Series and more expensive Pro and Saltwater Series propellers. A number of specialty boats will perform better with these specialized propellers. These propellers are generally more aggresive than the Standard Black propellers, so pick a pitch size one inch lower than the standard propeller. If a Pro or Saltwater Series prop was used previously, pick a pitch one inch higher when trying one of these propellers because they are slightly less aggresive.