Wholesale Prices in Price Matrix. These arrowheads are knapped from obsidian glass. Shapes and sizes vary. Pulled at random. This is a craft grade, one side is beveled and the other is flat. Average length 1"- 2" x width 1/2" - 3/4". Pre-Form arrowheads are a great addition to many different craft projects for adult use. Not recommended for children as they are sharp and made of glass. These Products Are NOT Indian Produced or an Indian Product as defined by 26 USA - 605 et Seq