Feature:1. Size Specification: The outer diameter of speaker cone drum paper is 75mm, inner diameter is 20mm, height is 16mm, the size is accurate.2. Premium Material: Paper speaker drum is made of premium paper. The sealed round edges are strong enough to resist scratching and stretching, blocking dirt and protecting the coils.3. Working Principle: Speaker cone with rubber surround (diaphragm) is the front of the speaker. When the coil moves back and forth, the driving cone vibrates like a drum skin, emitting sound and entering the air.4. Improve Performance: Paper speaker cone has a smoother high frequency roll off, but the paper cone can absorb moisture from the air, which changes its mass and damping characteristics.5. Application: Subwoofer cone drum paper for 3 inch speakers with 2 paper cover, used after installation, easy to install, no complicated steps or tools.Specification:Item Type: Speaker Cone Drum PaperMaterial: Rubber, PaperProduct Size: Outer Diameter: Approx. 75mm / 3in, Inner Diameter: Approx. 20mm / 0.8in, Height: Approx. 16mm / 0.6in.Package List:1 xSpeaker Cone Drum Paper2 x Paper Cover Note:Manual measurement, please allow some errors.