Potenz duo rings medium blackpenis rings, also called constriction rings are used for the premature outflow of blood from the penis (called venous effusion or veno-occlusive dysfunction). Requirement is that an erection is still possible. If this together ahead of time, it can be created with the help of the penis ring. Uniform compression in the field of the base of the penis counteracts premature blood discharge. The application performs blood flow obstruction to a considerable erection strengthening and stretching. A word about the size of penis rings: you should start with the largest size and gradually reduce the size depending on the effect. Please note that the rings can be worn no more than 30 minutes, as it can lead to circulatory disorders. Includes 2 rings. Size M. contains one sachet of aquaglide single-dose lubricant.