The compression molded Alias Wakesurfer from O'Brien has just the right amount of rocker through the nose and a single surf 2.1" fin. This allows the Alias to pump in and out of any pocket behind the boat. Load the boat with friends, add a ridiculous wake, and the Alias wakesurfer is sure to provide a great day on the water. Top deck is a durable foam polymer that is both soft and grippy. Featuring a flatter rocker pattern and classic profile, this wakesurfer packs plenty of speed. Alias 46: 4'6"L x 20.6"W. For 100-180 lb. riders. Alias 50: 5'0"L x 22"W. For 150-240 lb. riders.