used but new looking Boston Acoustics BA745 3-Piece computer speaker system. I got this from an estate sale nearby to build my own computer, but realized I don't need these. You're getting all three pieces, and each one looks like they've been taken care of to the greatest extent. Don't know much about them, other than they go together to complete the set. The subwoofer is 5.5"x7.25"x6". The adjustable speaker is 5.25"x3.5"x3.25", with the regular speaker having the same dimensions.