Material: Constructed from durable GPPS (General Purpose Polystyrene) acrylic plastic and a soft, absorbent polyether foam sponge. Design: Features a transparent case, allowing users to easily monitor water levels and see when a refill is needed. Safety: Uses water as the primary lubricant, ensuring it is non-toxic, odorless, and won’t leave greasy residues or stains on skin, paper, or clothing