They are constructed of a non-scratch, extra abrasive scouring pad that won't break down. The pad is then bonded to an open cell structured melamine eraser sponge that is identical to the material used in the Mr. Clean Magic Eraser®. Compared to 3M Scotch-Brite™ pads, our scrubby sponges are a versatile alternative that can clean stubborn stains found in a variety of industries including dirt, grease, grass, rust, and dyes etc. can be cleaned with little to no effort because of the open cell structure eraser and durable scratch pad.