Multifunctional: cultivation, incubation, examination under microscopy, centrifugation... concial shape of the tube eases the removal of the pellet 10 cm2 surface activated growth area with new surface quality resulting in crystal clear transparency large opening for complete access of pipettes and scrappers great clarity for visual control with inverse microscopes sloped and flattened upper side results in reduced refraction centrifugation in a 50 ml standard adapter at 1200 g segmental packaging of 4 protects the individual tubes of scratches during transportation and handling bag slits with laser perforation for easy opening mechanism The corresponding TPP tissue culture rack fits 8 x tubes in a horizontal position for storage in a CO2 incubator.