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 200'F. This space-age material will not rot, mildew or absorb odors. Bumper protects against scuff marks and surface damage. Threaded connection fits all Extend-A-Brush handles or Premium Extend-A-Brush quick connect handles with the 40034 adapter.