Constructed of high density fine Star prene* fibers with flagged ends to hold water and cleaning solutions for easier washing Bumper protects against scuff marks and surface damage High gloss boat varnish finish on wood block Will fit all "Extend-A-Brush" boat handles Will not scratch plastic sailboat windows *Star prene is a light for boats weight polymer fiber that does not stain, discolour or become brittle. It resists most cleaning chemicals and withstands heat up to 200°F. This space age material will not rot, mildew or absorb odors.