This pair of 5-1/4" indoor/outdoor 2-way speakers have a polypropylene cone woofer with a rubber surround and 1" metallized mylar dome tweeter. These speakers can produce up to 75W maximum and have a built-in bypassable, multi-tap (4W/8W/16W/30W/8ohm) 70V transformer. The speakers have an ABS plastic enclosure with aluminum grill and corrosion-resistant nickel plated push terminals. Yoke-style mounting brackets and stainless steel hardware are included. Dimensions are 9.5" H x 6.75" W x 7.25" D.