Performance Silicone Pump Sleeve Large Black from Blush Novelties. Upgrade Large Pump Sleeve fits 2.5 inches Cylinders. Long lasting. Comfortable and durable for extended functionality. Better suction. Creates an optimal seal on your penis pump. Easy. Hygienic and simple to clean. Peace of mind. Made from satin smooth, body safe Silicone. Contains no Fragrances, Phthalates or Latex. The Performance Silicone Pump Sleeve is a safe, secure way to ensure the best possible fit while pumping! This hygienic silicone sleeve is designed to create a superior seal when used with 2.5 inches penis pump cylinders. The material is stretchy but durable, for consistent use over time. Made of satin smooth silicone, it is body safe and easy to keep clean.