Beyma AST-50 4 Ohm Compression Tweeter w/Installation Kit - Pair AST-50 is a high sensitivity compression tweeter. It has an extended frequency range and Neodymium magnet that make it ideal for high frequencies reproduction. High sensitivity: 98 dB Extended frequency range: 5 - 20 kHz Neodymium magnet Mounting Brackets and Capacitors Included ; JB JFX Polypropylene Film Capacitor 3.3 F 630V