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 2.25 to 2.5 inch penis pump cylinders. The material is stretchy but durable, for consistent use over time. Made of pure platinum cured satin smooth silicone, it's easy to keep clean. Lab Tested & Verified Body Safe. Water Based, Hybrid Lube Safe