THIS IS A TWO PIECE DISPENSER OR ALSO KNOWN AS CRACKER FOR CO2, N20  NITROUS  OXIDE ,EZ  WHIPS  ECT  8G  GAS  CANISTERS  HAVE  A VARIETY  OF  USES  WHERE  THE CONTROLLED RELEASES  OF  COMPRESSEDGAS  IS  NEEDED . THIS  DISPENSER CAN  ALSO BE USED  TO DISCHARGE UNWANTEDGAS  CANISTER  IN A WELL VENTILATED  AREA  FOR  PROPER  DISPOSAL . IT IS MADE OF ALUMINUM .