Dave Scadden's hot adjustable oars raises the bar in aluminum oar performance. They incorporate a high tech and reinforced directional blade system that generates three times the power of a conventional straight blade oar. Combine that with the only adjustable length system in the industry and you will see why his new DSP oar is the most sought after oar on the market. Simply flip a lever on the shaft and it will adjust from 6ft. to 7ft. In seconds seconds making it the perfect length for any size rower... Incredible!!!