3 Way panel speakers Sold in pairs. Ultra low magnetic interference Upgrade from theMA505, this speaker is designed to fit the MA505 cutout. Coated internal wiring for long life Two 3-1/2" main cone, 1" tweeter Polypropylene Cones and Stainless Steel Grille stand up to harsh marine effects Heavy Duty ABS Plastic frame 10-1/8"H X 6-1/4"W X 1-1/2"D