The Crystal Blue Hand Held Personal Units are made of the finest food-grade polycarbonate, crystal glass, rare earth minerals and quartz compression. 432 Hz universal healing frequency is incorporated into all units, and the science of water enhancement is now at a level never before seen. Do not leave out during freezing temperatures. Freezing will damage the unit. Dimensions: 5 and 1/2 inches long; 2 and 1/2 inches wide.​