The Beckman JS-13.1 6 Slot Rotor is manufactured by Beckman Coulter. JS-13.1 Swinging-Bucket Rotor, Aluminum. Major applications: Harvesting bacteria, processing tissue homogenates, separating cell particulates. Isolation of cell membrane using density gradients. For use in Avanti J Series and J2 Series centrifuges. The pre-owned products will be thoroughly cleaned and fully tested to perform at manufacturer specifications before shipping.