All the metal used has a specific purpose and represent the sun and the moon and other planets. This bowl can be used for meditation, music, and chakra cleansing. A leather striker is included with this singing bowl and this bowl was hand-hammered in Nepal. Due to handmade bowl, the surface have several marked of hammered on it. The bowl have long lasting tune which create totally peaceful environment around you, those who are looking for real handmade bowl from Himalaya will not be disappointing by this bowl.This is handcrafted bowl therefore please note that each one might have slight variations in measurement and slightly different like you saw on pictures.