Students are always fascinated when something mundane 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 arrowhead measures 5-7.5 cm (2-3 in.) long. Available individually or in packs of 15 or 30. Caution: Arrowheads are sharp!