AUDIOPIPE 5.25" 6.5" 133 UF BASS BLOCKERS 300Hz @ 4 OHM 5-1/4" 6-1/2" 2 PCS 133 Uf 50 Volts 300 Hz at 4 Ohm Works Great For 5"X7", 6"X8" AND 6"X9" Speakers Non-Poplar 10 Percent Cap Frequencies blocked at: 4 Ohms: 0 - 300 Hz, 8 Ohms: 0 - 150 Hz Quantity: 1 Pack (2 Pieces)