Starbrite&';s Extend-A-Brush Heads are the utility brush of this generation. Designed of fibers that do not stain, discolor or become brittle, and resists most cleaning chemicals and withstands heat up to 200F, this brush is the ideal marine cleaning tool. The best selling brush on market Medium duty high density Star prene fibers for all around cleaning of soiled and stained surfaces This space-age material will not rot, mildew or absorb odors Will fit all Extend-A-Brush handles Heads Available in Soft, Medium, Coarse