This listing is for a pair of 1" soft dome tweeters removed from a RBH AC-525 center speaker. Tweeters were tested with music prior to removal & are in excellent working & cosmetic condition. This is a push in mount tweeter. The baffle hole opening required is 2". Face plate o.d. is 2 1/4". Impedance is 8 ohms & DCR = 5.7 each.