The Tandex metal interdental brush handle fits the Tandex Proxi line of interdental brushes. TANDEX PROXI is an interdental brush available in 6 different sizes. It is used in conjunction with the special PROXI metal handle. TANDEX's unique patented design ensures the metal tip of the handle is enclosed by the plastic head, thus avoiding the risk of trauma to hard and soft tissues in the mouth. The PROXI plastic head colours identify the brush sizes, which are the same as those of the Flexi interdental brushes.