Our exclusive 6 piece fire cupping jar set is made of medical grade molded glass with smooth, soft edges for the ultimate in client comfort. Each cup has a flat top for safely resting cups after cleaning. Each cup is made of thick, heavy walled glass and is designed for use by traditional Chinese fire cupping techniques. Heat or fire from a candle, disposable lighter, or burning cotton/alcohol ball held inside the cup and then removed is customarily used to create the vacuum. Includes: - 1 X-Small (Outer Diameter: 2.25") - 2 Medium (Outer Diameter: 3") - 2 Large (Outer Diameter: 3.4") - 1 X-Large (Outer Diameter: 3.75")