Further in "Skáldskaparmál", Snorri relates a story where Loki cuts off Sif's hair as a prank. When Thor discovers this, he grabs hold of Loki, resulting in Loki swearing to have a headpiece made of gold to replace Sif's locks. Loki fulfills this promise by having a headpiece made by dwarfs, the Sons of Ivaldi. Along with the headpiece, the dwarfs produced Odin's spear, Gungnir. As the story progresses, the incident leads to the creation of the ship Skíðblaðnir and the boar Gullinbursti for Freyr, the multiplying ring Draupnir for Odin, and the mighty hammer Mjöllnir for Thor.