This Assassins Creed Gauntlet Replica is about as realistic as it gets. Part of Ezio Auditores garments, it perfectly recreates the gauntlet in the Assassins Creed series.

Aside from the beauty of the armband itself, it features spring-loaded action and a rubber-like blade. Ezios Gauntlet comes in two separate parts: the Outer Vambrace and the Inner Wrist Guard (where the spring-loaded action resides). It comes in one-size-fits-most, with adjustable straps to fit almost any forearm:

Inner Wrist Guard Wrist measures to 4 1/2 inches, Forearm measures to 5 inches

Outer Vambrace 10 3/4 inches