Star brite Extend-A-Brush heads are made with Star prene, a lightweight polymer fiber that does not stain, discolor or become brittle. It resists most cleaning chemicals and withstands heat up to 200F. This space-age material will not rot, mildew or absorb odors. Star Brite white scrub brush Ideal for non-skid and textured surfaces High density, stiff Star prene fibers Fits all Star Brite Extend-A-Brush quick connect handles Fibers will not stain, discolor, or become brittle 8 in. brush head width Brush will not rot, mildew, or absorb odors