If you're looking for a concealable self-defense tool, i would look into Cold Steel's Pocket Shark
http://www.coldsteel.com/Product/91SPB/POCKET_SHARK.aspx
They're hard, heavy and blunt enough to jam in an attackers eye or neck, they can be used the same as a kubaton for grapples and locks, plus they can be easily carried in a pocket or sleeve. Plus they're really nice permanent pens, so there's that.
Also, the site sells sword canes, just saying.
http://www.coldsteel.com/Product/91SPB/POCKET_SHARK.aspx
They're hard, heavy and blunt enough to jam in an attackers eye or neck, they can be used the same as a kubaton for grapples and locks, plus they can be easily carried in a pocket or sleeve. Plus they're really nice permanent pens, so there's that.
Also, the site sells sword canes, just saying.