I've taught non-traditional kendo for years and I'm always looking for a new tool to give my students a different experience.  These bucklers did the trick.  They are small, relatively light, but VERY sturdy.  If there was a problem with them it would be that the handle is too large to be able to simultaneously hold a dagger in that hand (as some styles suggest was done).  That being said, they are great and offer a realistic alternative when training.