Cleaning sponge that measures 5cm in thickness. Made from a non-woven fabric with acrylic beads that can remove dirt with just water, as it is a self-foaming sponge. Will not scratch surfaces yet washed thoroughly. Uses a three dimensional slit processing that is quick foaming, retains the foam and also has quick drying properties. Comes in a slim design that is easy to grasp despite its thickness, and is easy to wash cups with. Made in Japan.