These trays are idea for carrying vessels and culture tubes through continuous plant tissue culture operations including washing, filling, autoclaving, transporting and incubating without extra handling. This shelving module can rest on incubation rack channels instead of shelves. The tray ventilates and eliminates hot spots between shelves, allowing for more closely spaced shelves on racks. They also allow for even distribution of light. Autoclavable and reusable, these trays are sold as 50 per case.