Bose 151 Environmental Speaker Pair with Brackets (Black) Next-generation outdoor speakers Three 2" full-range drivers in an Articulated Array speaker design 2 1/2 full-range glass-filled speaker cone Glass-filled polypropylene cabinet What's in the box: 2 speakers, 2 mounting brackets, 2 bracket locking screws, 4 1/4" lock washers, 2 #8 lock washers, 4 1/4"x 9/16 bracket-to-speaker mounting screws, 4 #12 x 1 3/4" wood screws, 4 #12 x 1 wall anchors