i recently bought a cheap katana which is made of wood on the outside but has a real blade on the inside, i was wondering what it was called and where i could find a good one. ive heard somewhere that this is a "hidden" katana or something of that sort. it looks like a curved piece of wood. it looks something like this http://www.topicool.com/images/products/lp_3036nt4_1_600.jpg but with more curve. please reply, thanx