The Metrex Research 104025 is a specially designed cleaning sponge for medical instruments. These sponges are used in conjunction with Metrizyme, a powerful enzymatic cleaner, to effectively clean and prepare medical instruments for sterilization. The sponges are designed to thoroughly clean instruments without causing any damage. They are sold in a box of 25, making them a cost-effective choice for any healthcare facility. Please note that these sponges are intended for single-use only to prevent cross-contamination.