I have been using these wicks for nearly five years now, never having a problem. I order these in bulk (about 3,000-5,000 wicks in a clip) and I have recently had numerous customers complain of terrible tunneling. We have done many tests, finding the exact same results. We haven't changed our jar size, wax type, or fragrance recipes in any way, so the only thing I can think of is that this wick has been updated/modified within the last six months, FOR THE WORSE. This inconsistency is a major problem and I will not be reordering because of it.