TubeSpin bioreactors
are orbitally shaken centrifugation tubes with a gas permeable polytetrafluorethylene filter in the lid. They were developed for the screening of suspension cells. Three sizes are available (e.g. from TPP): the TubeSpin 15, 50 and 600 bioreactor. The maximum working volume is 400 mL. See orbitally shaken bioreactors and surface aeration.