2.5" x 2.5" LeSon Style Piezo Horn Tweeter T-1011GR Size: 2.5" x 2.5" (3.25" diagonally), Hole cut-out: 2", Depth: 2" Power: 75 watts Response: 4 kHz - 22 kHz, Sensitivity: 92 dB LeSon TLX-1 style Piezo tweeter Used in many SWR Workingman Combo amps and others!