This calorimeter consists of two nested aluminum cans separated by a 1.7 CM thick styrofoam liner and a clear molded plastic lid with a filler cap. A plastic insulator ring protects the styrofoam insulation against damage and liquid spills. The inner reservoir has a capacity of 150 ML. A thermometer stopper and an insulated stirrer are included. Instruction manual included. Shipping weight: 0.5 Lbs., dimensions: 7" x 4" x 4".