4.5″ x 3″ premium synthetic sponge on one side, non-abrasive acrylic grain scrubbing surface on the other. Deep grooves provide constant contact with the scrubbing surface to remove all debris. Debris will not clog abrasive surface and the sponge rinses clean. Antibacterial and antimicrobial to fight odor causing bacteria and mold build-up. 3 pack.