Made by steel-titanium alloy and strictly hand-modulated produce accurate & beautiful tune .The steel tongue drum is made of steel-titanium alloy and precision-cut by professional craftsmen to make 8 notes pronounce accurately to get an ideal ethereal tone. The sound is crisp and clear which helps to relieve anxiety, features 8 notes with a wider range of sounds to play most songs. (Diameter sizes are available from 8cm to 12 cm .Prices are vary from size to size)