Students are always fascinated when something familiar like a rock is formed into something useful like an arrowhead. These recently made large arrowheads were hand-crafted from volcanic obsidian. Each is unique. A great demonstration tool when teaching about Native Americans, igneous rocks, or man's early use of tools. Each large arrowhead measures 2-3 inches (5-7.5 cm) long. Caution: Arrowheads are sharp!