The SECF-SET sets you up with all of Sela's 'Frosted' Crystal Singing Bowls in one go. Based off the A-note concert pitch at 440Hz, the bowls are tuned to the notes B, A, G, F, E, D and C, and come including mallets as well as silicone rings for safe placement and optimum vibration. Ranging from eight to fourteen inches in diameter, each singing bowl shapes a melodious, sustain-rich tone that rings out longer and brighter than the sound of a metal singing bowl. The bowls can be played by running your fingers or the mallets along the top edge or by simply tapping them. Three mallets come included as standard: a wooden mallet with a rubber head and two rubber-coated rubbing sticks made of glass.