[Dimensions] Inner diameter: 25.5mm/0.99inch; Outer diameter: 130mm/5.07inch; Outer diameter: 115mm/4.49inch; Inner diameter: 93mm/3.63inch. [Technical Features] Cone material: premium paper; Rim material: foam; [Paper cone] Paper cone is smoother high frequency roll-off. [Quality Assurance] : Paper cone woofer is made of premium paper, which is scratch resistant. Sealed round edge blocks dirt and protects coil. [Application] The cone is the front of the loudspeaker. Moving the coil back and forth moves the cone like a drum skin, blowing sound into the air.
