Materials: Natural Loofah, Cellulose (Wood Pulp, Sisal Fiber). These sponges are made from real loofah plants. Due to the nature of the plant, thickness and coarseness will vary. Each sponge measures approximately 2.5 inches x 4 inches. CARE: Recommended letting the sponge dry out completely after each use. Clean the sponge weekly by soaking it in a diluted vinegar solution for 5 minutes and then rinse thoroughly. These sponges last several months, they do not deteriorate easily.