Here's one for the gym Jun 17, 2012 7:19:27 GMT -5 Quote Select PostDeselect PostLink to PostMemberGive GiftBack to Top Post by Adam D. on Jun 17, 2012 7:19:27 GMT -5 That may explain why some have fiberglass blades and some are plastic, and other variations.. But I guess no one really knows, and probably will never find out all the little details..