The Kodiak Alutiits used two types of harpoons for hunting harbor seals: a small and a large. The small harpoon was of the same form as the light harpoons used for hunting otters. But they had different points: the harpoon used for hunting otters had a point with notches on both sides while that used for seals was only notched on one side.
The small harpoon used for hunting seals was thrown with a throwing board while the large harpoon was thrown by hand. As opposed to the small harpoon, the large harpoon had to have a float made from a sea animal bladder attached to it.