For sale is a PAIR of windshield wiper covers which are inserted between the wiper blade and cowl. 

Designed by the seller to improve upon the original, brittle, paper thin design, the seller has utilized modern materials and made this out of a UV resistant plastic.  These are designed to be removable. There is a flat slot on the bottom of each plastic cap/grommet which allows for easier installation and removal, as well as giving extra clearance on the bottom of the wiper cowl.