The effects of metals such as cobalt (Co). cerium (Ce). magnesium (Mg). nickel (Ni) and titanium (Ti) added to diamond-like carbon (DLC) films on boundary lubrication properties were investigated using a ball-on disk tribometer. https://www.roneverhart.com/10-oz-Black-Thermal-Plastic-Molcajete-Bowl-5-1-4-x-5-1-4-x-2-1-2-1-count-box/