The super large vacuum massager butt cup is only used in our vacuum cupping machine. The 120-180ml large docking cup is made of high quality materials. It is completely harmless to the human body, Diameter: 21cm / 8.23 Capacity: 180ml, 17.5cm / 6.88in Capacity: 160ml, 15.5cm/6.19 Capacity: 120ml. At present, our vacuum wind is only suitable for our vacuum machine. Please check the and refer to the specific size before purchasing. Please note that we only sell vacuum cups and do not include any other instruments. If you have any questions, please contact the seller.Notes:Only the vacuum cup does not include other itemsThe color of the picture may be slightly different from the actual product, please make sure you do not mind before you order. buyThe product needs to be matched with a professional vacuum machine to make the buttocks more endowed. Currently, this product is only used for vacuum cupping accessoriesPacking list:2 vacuum hip cup Note: The data are all manual measurement, please allow an error of 1 - 3cm, due to the light and display difference, there will be some color difference, depending on the physical object received.