Steelbook
From Tardis Wiki, the free Doctor Who reference
A Steelbook is a limited run of a Blu-ray edition of a Doctor Who, Torchwood, The Sarah Jane Adventures, Class or K9 television story, packaged in a premium metal case with classic or specially made artwork. The steelcase provides both a better canvas for displaying the art that comes along and being a more durable way of storing the discs.
