XS-28 - Image Dynamics 28mm Silk DOme Tweeters (Pair) 28 mm hand coated soft silk dome | Removable face plate and grill assembly | Multiple mounting options, separate and coaxial | High grade neodymium motor structure | Aluminum wire voice coil Power: 100 watts Impedance: 4 Ohms Sensitivity: 93dB Mounting depth: .85"