Polk Audio R150 Two-Way Bookshelf Loudspeakers (Pair) Pair of 2-way bookshelf speakers perfect for small room or multi-room applications Equipped with one 5.25-inch dynamic balance mineral filled polymer composite cone driver Frequency Response: 60Hz - 24kHz Equipped with one 0.75-inch dynamic balance silk/polymer composite dome tweeter Magnetically shielded for safe placement near TVs and computer monitors