The experiment will test arrow points made from six materials of varying fracture-toughness. Different target media, including rawhide, will be tested. It has been argued that the Apache were the first to use rawhide shields in the Southwestern US, and Pima points were often made of high fracture-toughness basalt. This is surprising because previously arrow points were rarely made from basalt, and the Pima may have using basalt to penetrate Apache shields.