The OLFA AK-4 is a cushion-grip art knife designed for controlled, detailed cutting in craft and hobby work, including paper, film, and light materials. The package includes four interchangeable blades, letting you switch between fine-point, chisel, and curved carving profiles without changing tools. Use a proper cutting surface, tighten the collet before cutting, and change blades with the quick-spin system while keeping hands clear of the edge.