Polk Audio RTI A1 Bookshelf Speakers (Pair， Black)<div style="text-align: left;"><strong>[Product Information]</strong><ul><li><span class="a-list-item"> Pair of real wood bookshelf speakers with all MDF construction and resonance-free enclosures </span></li><li><span class="a-list-item"> Equipped with one 5.25-inch dynamic balance mineral/polymer composite cone driver </span></li><li><span class="a-list-item"> Features Power Port technology to reduce "chuffing" or "port noise" </span></li><li><span class="a-list-item"> Equipped with one 1-inch silk/polymer composite dome tweeter </span></li><li><span class="a-list-item"> Features a neodynium magnet， low viscosity ferro-fluid cooling， and a heat sink on the back of the magnet </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/51bn1jmDgoL.jpg" noproxy>