This set of plastic protectors fit underneath commonly damaged plastic parts. They deflect edge strikes; reinforce against airballs; and prevent metal from scratching up the back of plastics.
These protectors are made from impact resistant PETG and will not break from ball strikes. Product ships with blue/white protective film, remove for installation.
1) Don't overtighten! Hand tight + 1/4 turn is plenty. More than that, and things start to warp and crack.