HANDLE: wide support and anti-slip system. TYNEX FILAMENTS, with polished and rounded tips, protect teeth and gums, while shorter filaments effectively remove plaque and longer filaments facilitate the cleaning of interdental spaces. - Medium model: 8 mils outer filaments and 7 mils inner filaments.- Soft model: all 6 mil diameter filaments.- Orthodontic model: 6 mils Tynex filaments on the outside and 7 mils Tynex filaments on the inside with a"V" cut to ensure proper dental and interdental cleaning and good hygiene of orthodontic appliances. Small and diamond-shaped head for easy cleaning of hard-to-reach areas, with polished and rounded angles to prevent chafing. Protective SHELTER. With AAA alkaline batteries.