11.   The disks are about two inches in diameter and Teflon-coated so they slide across a smooth floor without damaging the surface.

12.   The sap will damage some surfaces.

13.   The valve seat is made from soft brass, and corrosion or wear can damage the surface.

14.   Will it damage the surface if you set a wet glass down on a waxed table?

15.   If a skater falls and damages the surface, Norman hauls out one of the two extinguishers he has.

16.   The combination is environmentally friendly, does not damage surfaces or require cleanup, McDonald said.

17.   The Progress slightly grazed against a solar battery protruding from the Spektr module, apparently damaging its surface.