Zeitgeist: The Gears of Revolution
Hand cuffs designed specifically to restrain spellcasters
Wondrous item, common
When a person wearing mage-cuffs uses any magical power (generally defined as casting a spell or using a supernatural or spell-like ability), the cuffs glow, make a warning whistle sound, and deal 1d6 points of electricity damage to the wearer. A creature reduced to 0 hit points this way is knocked unconscious, not killed.
Aura abjuration; Weight 2 lbs; Price 1,500 gp.
Requirements alarm, detect magic, shocking grasp
Cost 1,500 gp