Each box contains 20 patches (CGM not included). This gentle Libre 3 Sensor Cover use natural ingredients and a non-latex adhesive, making them safe for even the most sensitive skin. Full Cover & Water-Resistant: Jinyusega Libre 3 sensor covers waterproof are designed to be water-resistant,no glue in center, allowing you to swim, shower, or engage in activities without worrying about damaging your sensor.