Uncomfortably firm suction is a thing of the past with the Universal Pump Sleeve! The soft and incredibly comfortable sleeve cushions your penis with soft and stretchy TPR, a material used on toys ranging from masturbation sleeves to dildos because of its amazingly soft and realistic feel. The Universal Pump Sleeve fits over the base of your pump’s cylinder to create a more enjoyable and relaxed pumping experience. The sleeve is body-safe and flexible to suit your pumping needs. Fits pump cylinders up to 3" (7.5 cm) in diameter.