Saris' Protect-O-Pads are foam blocks that separate and protect your bikes when multiple bikes are being transported. They come in packs of four.
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I first purchased these blocks from The Cycle Path in Tuscaloosa AL almost 20 yrs ago I still have the same car, bike rack and Saris bike blocks). They have paid for themselves many times over in preventing car damage. I've recommended them in reviews when bike rack product reviewers complain about rubbing and scratches from wind-vibrated mounted bikes.