How to use: 1. Make the cupping mouth close to the human body injured area with fingers pressing the cupping to release the air in the cupping. 2. It can create the negative energy so that the cupping can suck on your body. You can press it repeatedly for adjusting the suction. The appropriate time for each use is about 20-30 minutes. 3. Slowly lift the cupping from one side of the cupping mouth to make air in, and then remove the cupping. Specification: Item Type: Cupping Material: Silicone Item Color: Blue Item Size: Size 1, Size 2, Size 3, Size 4 Item Number Size Inner Diameter 1 4 x 3 cm / 1.6 x 1.2 inch 2.5 cm / 0.9 inch 2 6.5 x 4.5 cm / 2.6 x 1.8 inch 4 cm / 1.6 inch 3 8.5 x 6 cm / 3.3 x 2.4 inch 5.3 cm / 2.1 inch 4 10 x 7.5 cm / 3.9 x 2.9 inch 6.4 cm / 2.5 incPackage Weight: Approx. 420 g / 14.8 oz Package Include: 4 * Cupping (Different Size) Note: 1. It is necessary to take care the time, the cupping size and the suction when you cup the different body regions. 2. Combining with the targeted acupoint for achieving better effect. 3. Use the alcohol cotton cloth to clean the cupping mouth and your skin before operating. 4. Do not share the cupping with others. 5. Cupping is not recommended for those people who has tetanus, epilepsy, cardiopathy, etc. Pregnant women, renal and respiratory failure and extremely weak people should not be cupping.