Black oxide is a chemical treatment for carbon and stainless steel. Black oxide can be finalized with a matte, satin, polished or brushed. Includes removal of dents and scratches, stripping of previous finishes, and color fills up to four colors. We suggest bright colors or the all black paint fills. This putter requires less maintenance than an oil can, but carbon putters will still rust with this treatment. Black Oxide on carbon steel should be treated as raw metal and will require maintenance to prevent rusting.