Chris,<br><br>Is it neccessary to round the edges of the bullroarer? What about making the whole thing concave? I've viewed a few online; some seem to have the edges rounded, some do not. Some seem to be concave in profile, some do not. Oddly (or maybe not), all of the ones I viewed are labeled as being 16" in length. Can they be smaller? Larger?<br><br>Thanks, and sorry for all of the pesty questions.<br><br>Take care,<br><br>Andy