Recently we were contacted by a customer about a Wheel Woolies kit he had purchased. On one of the brushes, the head had separated from the handle. He had attempted to use an adhesive to re-attach but this was not a successful fix and the pieces eventually separated again. We promptly replied to him that all of our detailing brush heads are ultrasonically welded to the handles, no glue or adhesive is ever used. Therefore, the problem must have been a faulty weld and we would replace his brushes immediately and ship them out at our expense.