A sealed ampoule of pressurized supercritical Xenon gas.  Purity is 99%+.  This amazing sample will phase change before your eyes when cooled below 16°C.  Let it warm up above 16°C and watch it boil away into the gas phase again.  The first picture shows a cooled ampoule on the left in liquid phase and a room temp ampoule in gas phase on the right for comparison.  This is truly an amazing sample and fun to watch!  This fits perfectly inside the included 1 dram vial for display.