Whaling has a greater emphasis in the Punuk stage. Hunters would use umiaks and kill whales in narrow ice leads as well as in the open sea in the fall. Open sea whaling required skilled leadership, teams of expert boatmen and hunters, and the cooperation of several boats. The whaleboat captain, the umialik, is still a prominent position in Arctic communities today. Chipped stone tools were replaced by ground slate, ivory winged tolls were largely replaced by tridents, and iron-tipped tools were used for engraving. Harpoon styles became simpler and more standardised, as did Punuk art. The Punuk developed their methods of hunting that led to the creation of armor made from bone as well as the technology of the bow and arrow. As well, bone plated wrist guards, the reinforced bow, bird bola, heavy ivory net sinkers, and blunt tipped bird arrows appeared in the Punuk stage.