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.. Great for non-skid and textured surfaces. High density, stiff corrugated Star prene fibers quickly break down heavy dirt and stains. Will fit all Extend-A-Brush handles. Heads Available in Soft, Medium, Coarse.