- Made from High Quality Heat Treated Aluminium Pipes producing beautiful and long lasting sound. Carefully tuned to actual frequency as mentioned. with Accuracy level of +-0.05%. Gives Great healing effect. These 2 Healing Tuned Pipes are based on: S1 528 hz & S2 520.17 hz Frequency. Difference of both pipes frequencies is the Schumann Frequency. Dimensions of Pipe: Length – 21 inches appx. Diameter – 1 inch appx.