Supports neck and chest. Develops neck, shoulder, and arm muscles. Constructed of 3/4" (2cm) plywood, cushioned with padding. Padding gradually increases to 9" thick (23cm) under chest area to elevate the head and shoulders, enabling the user to concentrate on arm movement. Scooter is 16"W x 43"L (41 x 109cm), covered with washable, vinyl-coated nylon. Rolls easily on 4 casters which swivel at the front for 360° maneuverability. Equipped with nylon-webbed adjustable safety straps and a top rope which stores under unit when not needed.