Zombie head
Jade idol arms was removed from RuneScape after an update, but still exists in-game for those who had obtained it.
[FAQ] • [doc]
Jade idol arms detail

Jade idol arms are a common reward from the Squeal of Fortune. They are part of the Grinning idol promotion. They are combined with the body and legs for all players, as well as a head for members only; to gain experience in the Construction, Defence, Herblore, Mining, and Woodcutting skills.