Two high-density foam inserts to accommodate up to 60 microtubes. This insert fits into the 6-in (152mm) Platform attachment (Part No. 146-6005-00) and one is included in the Multiple Sample Starter Set (Model H301, Part No. 504-0233-00) for use with the Vortex-Genie 2 family of mixers and the Vortex-Genie Pulse.