I really like those chrome Sonor snares from that era----i think some earlier ones had a smooth shell and as far as the throwoff goes----it's one of those little gems in the drumworld, that goes beyond the pale ; a long way actually. those lumps on the shell are usually referred to as ribs but they could just as easily be called crimps or humps but spine would probably be the most accurate----when its just one down the centre. perhaps when there is more than one it could be called duospinal or trispinal or even multispinal. How about Polyribbons! ------"WHAT'S ALL THAT NOISE??"........................... " Liten up man, um jus noodlin' arown with mu polyribbons"