AUDIO SYSTEM Neodymium tweeter 24 mm, Protective grille, mounting and substructure holder, ferrofluid cooling, Outer diameter with holder: 53.5 mm, without holder: 44 mm Installation depth with holder: 16 mm, without holder with grille: 20 mm Installation dimensions with holder: 47.5 mm, without holder: 42 mm Housing height HT: 28 mm, Impedance: 4 ohms Suitable for: 24 mm