Monolithic bullets are bullets which are constructed from a one solid material, usually metal, and do not have multiple components. Unlike jacketed hollow point bullets (JHP), monolithic bullets do not have a jacket, cup, core, or tip. They are instead a solid material, typically copper or a copper-zinc brass alloy, although historically any bullet made of a single type of metal can be referred to as a monolithic bullet. Monolithic bullets depart quite dramatically from the better known lead- or jacketed bullet, and offer a more environmentally friendly alternative to the toxicity associated with lead bullets. As a result of increasing environmental concerns over the toxicity levels found in lead-based bullets, some areas in the United States of America have banned the use of lead bullets