The Shimpo RK-Whisper is the quietest wheel yet. The exterior of the Whisper resembles that of the RK-10, but that is where it stops! Featuring a 1/2 hp brushless DC motor that is incredibly quiet and powerful. The motor offers a broad speed range, an electronic controller that maintains your speed and also this wheel has a built in breaker so it will always be protected from overloading. Comes with splash pan included.