Already mentioned above, but adding additional information:
Rim strips can be made from, as far as I know: tape, rubber, plastic. I have experienced issues with rubber and plastic:
Rubber: The rubber that covers the spokes fails and the sharp portion of the spoke, or nipple punctures the tube.
Plastic: The plastic protector split over a recessed spoke hole on the rim. This was not visible when not under pressure. It could only be found when pushing down with your finger over each spoke hole.
I transitioned to tape on all rims years ago.

When I remove flat tires and tubes from the rim, I strive to trace back to a specific point in the tire and rim to check for issues: glass / wire / etc on the tire, or problem with the rim, or problem with the rim strip.