Dental hygiene and cleaning of interdental spaces. These refills for GUM Proxabrush Classic interdental brushes correspond to the Proxabrush Classic handle. They are tapered with a diameter of 1.6 mm to easily pass through interdental spaces. The nylon monofilament bristles with chlorhexidine help inhibit bacterial growth on the brushes. They are easy to use and attach. Contains 6 refills for interdental brushes.