- It has the glass breaker tip, which really is strong enough to break glass (I tried it). Be warned: it takes the finish off the tip when you use it on things! I punched it through some thin boards, some glass, and some heavy cardboard. It works, but now it's down to bare metal on the tip. This tip seems far more useful than the one on the other Uzi pen, the one that claims you can use the tip to capture DNA from an assailant. What a ridiculous marketing ploy!