These backing plates are machined from billet 7075 aluminum and hard anodized black. These billet aluminum plates are many times stronger than the original. They are a perfect machined fit and will not void your warranty. These plates can be installed by anybody in just minutes. No special tools . . . a pen works most of the time. Most designs can be engraved on a polished clear anodized backing plate for a small fee. ( Polished / brushed aluminum looking with black engraving )