Road Gear Dual Cone Speaker 4" 40 Watts Foam Surround Hole Cutout Size 3.9" approximately Individual Double Blister Sealed Packaging 4" Dual Cone - Polypropylene and Metal Cones Diagonally Screw Holes are 4.5" Center on Center Horizontally or Vertically Screw Holes are 3.3" Center on Center Mounting Depth 1.9" approximately 4.2 Oz Magnet 4 Ohm Impedance 40W / 20W Max / Nominal Power Rating