These buttock lifting cups are precisely engineered for Bellaskin devices and compatible with a variety of other machines. Please note that the Y hose required for connection is not included. Available in carefully measured sizes—Small (5.6L x 5.7W), Medium (7.8L x 6.0W), Large (7.5L x 6.5W), and X-Large (9.3L x 8.3W)—they provide an elegant solution for tailored and effective lifting treatments.