Some recent tests have demonstrated that needle bodkins could penetrate all but heavy steel plate armour; one test used padded "jack" armour, coat of plates, iron and steel mail and steel plate. A needle bodkin penetrated every type, but may not have been able to inflict a lethal injury behind plate. As with all other tests, accuracy of these tests is called into question as the arrowheads were all high carbon steel and hardened, and the historical accuracy of the armour tested is unknown. In one test of historical arrows from the London Museum, a "type 16" barbed arrowhead was indeed found to be steel; the composition of the other types of arrowheads (including bodkins) was not tested.