Do you need new castors for your Lobby Chair ES 104? The castors are part of the original construction of Lobby Chair ES 104. They meet the highest quality standards and are characterised by accuracy of fit. Castors are available for different floor types – hard floors (e.g. wooden floors) and carpets – and are sold individually (in chrome or black). In most cases, Vitra recommends replacing all the castors on your product at once to ensure a smooth and consistent rolling movement.