Wall Protector

From the website:

Wall Protector

No More Doorknob Dents

Prevent unsightly holes and damage from a doorknob hitting the wall.

Clear protectors are almost invisible once in place, so they won’t detract from your decor.

Each 2¼" dia. peel-n-stick Wall Protector goes up in seconds.

Engineered to absorb shock.

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Two for $5.95 (doorknobs not included).