Sakura Finetek - This cold plate is made from a polystyrene top and base molded together for a tight seal, with an additional Styrofoam insulator at the base to prolong cooling and prevents moisture accumulation. The plate freezes in about 4 hours in a freezer and the surface remains cold for up to 3 hours. The plate is ideal in chilling and preparing paraffin blocks for sectioning at the microtome or for other laboratory procedures. Not for use with organic solvents such as toluene, xylene, acetone. It holds up to 24 cassettes or embedding rings. Measures 11"(L) x 5½"(W) x 1"(H). Packed 6 cold plates and 1 insulator base per package; 4 packages per case.