These inner fender liners are a major upgrade after the stock (plastic) ones. These liners are very sturdy, exceptionally well made, and they give more space for bigger tires. It is easy to install them, if you follow the instructions. In addition, it is easy and fast to remove them, if you need a better access to Wrangler's suspension and lower engine area. They match with the wheel wells geometry, and protect inner parts from mud and rocks and snow. When a rock ricochets from a tire it dings the inner fender liner with the sound like a bullet hitting a metal target, it was unusual to hear in the beginning but later I got used to it. These liners made of a nice metal (with a sturdy paint), so such sound is normal, and actually, uncommon, occasional. If somebody really wants to reduce any possibility for such sound it would be possible to apply a thin layer of a sound-dampening foam on the outer surface of liners, but (based on my experience) I consider it as an excessive measure. These liners are good as they are! Also, these fender liners have a truly beautiful look! Remember, wash them well after your off-road trails and adventures!