Made from 6-7 oz leather, dyed coal black with leather straps and large 1 inch spikes attached with nickle plated rivets. Wrist cuff laces along the bottom.  

Measurements

3 inches long (from wrist to forearm)
8 1/2 inches wide at wrist
9 1/4 inches at widest (slight taper at the forearm)

Listing is for a single bracer. All measurements are approximate.