The Performance Silicone Pump Sleeve is a safe, secure way to ensure the best possible fit while pumping! This hygenic silicone sleeve is designed to create a superior seal when used with 2.5-inch penis pump cylinders. The material is stretchy but durable, for consistent use over time. Made of satin smooth silicone, itft.s body safe and easy to keep clean. Large Pump Sleeve for 2.5 Inch Cylinders Comfortable and Durable Maximum Seal Easy to Clean Made from Satin Smooth, Body Safe Silicone. Contains no Fragrances, Phthalates, Paraffins or Latex