Polk Audio 2 Pairs Signature Series S10 2-Way American HiFi Home Theater Compact Satellite Surround Speaker， (4 speakers)<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Tweeter: 1x 1" Terylene High-Res Dome Tweeter</li><li>Mid-Bass: 1x 4" Dynamic Balance Mica Reinforced Polypropylene Driver</li><li>Crossover Frequency: 2.5kHz</li><li>Wall Mounting Option - Key Hole slot: Yes</li><li>Wall Mounting - 1/4"-20 Threaded Insert: Yes</li></ul></div><img src="http://ecx.images-amazon.com/images/I/41oCm5GfVwL.jpg" noproxy>