Bullets are typically made of lead with various other trace metallic substances and alloys. The second cowboy is referring to Certified Reference Materials (CRMs), which are measurement standards used for measurement analytics.

Molars are a unit of measurement in chemistry, which refers to the number of moles per liter of a solution (concentration molarity). Another definition for molar is that of a mammalian tooth.

The periodic symbol for copper is Cu and the symbol for tellurium is Te, hence “cute”.