The Pioneer TS-A1375R 5-1/4 In. 3-Way Speakers features a multilayer mica matrix cone where a surface containing mica properly maintains the cone's superior rigidity and internal loss while another layer makes excellent use of light, water-resistant material. Highly elastic polymer surrounds help keep cone movement under control, for smooth, tight bass. Package Content:TS-A1375R two 3-way speakers two grilles, two 12 in. lengths of speaker wire, mounting hardware, manual, warranty. Sensitivity 89 dB, Impedance 4 ohms, Height 2.10.Batteries Included. Language English, Spanish, French Assembly Required.