Genics' Cobra Rods wood preservative rods are ideal for treating new and existing wood structures. Made up of copper and boron, the Cobra Rods are both safe to use and easy on the environment. Millions of Cobra Rods have been installed in power poles in the last decade. Being odorless, Cobra Rods can be used indoors and require no breathing protection. Cobra Rods use the moisture present in the wood to 'activate' or dissolve and migrate with that moisture, thus moving the preservative where it is most needed.