Alpine S2-S40C - Next-Generation S-Series 4" Component Speaker Set - Woofer Size: 4” Tweeter Size: 1” (Component) Maximum Peak Power: 140W Maximum RMS Power: 45W Frequency Response: 97Hz - 40kHz (Hi-Res) Hi-Res Audio Certified Poly Propylene, Glass Fiber, and Mica Cone Material High-Amplitude Multi-Roll (H.A.M.R.) Surround Included 1” Tweeters with Threaded Removable Housing OEM Fitment with In-Line Crossovers Alpine S2-S40 - Next-Generation S-Series 4" Coaxial Speaker Set - Woofer Size: 4” Tweeter Size: 3/4” (Coaxial) Maximum Peak Power: 140W Maximum RMS Power: 45W Frequency Response: 97Hz - 40kHz (Hi-Res) Hi-Res Audio Certified Poly Propylene, Glass Fiber, and Mica Cone Material High-Amplitude Multi-Roll (H.A.M.R.) Surround Integrated 3/4” Tweeters (Coaxial)