Two high-density Foam Inserts are customizable by the user for odd-shaped vessels. The insert fits into the Recessed Platform (Part No. 504-0039-00) for use with the Vortex-Genie 2 family of mixers and the Vortex-Genie Pulse. One insert is included in the Large Sample Set (Model H302, Part No. 503-0282-00).