Joker Energy is optimal for indoor and outdoor use. Progeo Joker Energy wheelchair features elliptical tubing for improved rigidness, and boasts a stylish design and look. Key Benefits Fully Welded: Featuring a fully welded customized rigid frame with an flexible back rest. Renowned Functionality: Renowned functionality of the Progeo Joker has been further enhanced with this extremely lightweight, complete wheelchair. Produced Ultra Light: Produced using an ultra light aluminum adulterant and carbon fiber elliptical frame tubes.