Specifications:Material: PVC+GlassColour: Blue (as shown)Quantity: 4 pieces/setSize: #1, #2, #3, #4Height (with ball): 96 mmCup bottom outer diameter: 15mm (#1), 25mm (#2), 36mm (#3), 52mm (#4)Cup Bottom Inner Diameter: 9mm (#1), 14mm (#2), 22mm (#3), 36mm (#4)Delivery content:4 * Glass Vacuum Cupping Cups 1. Adopt cupping therapy to promote blood circulationand driving out cold and dampness for daily health care.2.Flexible thickened PVC cups can be squeezed effortlessly,to get a better vacuum effect immediately. They are durable.3.The detachable and detachable design makes cleaning a breezeChild's play for more hygiene and saves space for storage.4. High quality glass allows smooth edge and fine workmanshipfor improved cupping comfort without hurting your skin.5. Total 4 size variations to treat differentBody parts with safe placement, flexible to use according to your needs. A notice:Please allow 1-3cm error due to manual measurement andmake sure you don't mind before buying.The color of the actual item may vary due to differentComputer screens and display settings may vary slightly from images.Thank you for your understanding!