4 Inches speaker paper cone, fit speaker voice coil up to 19.5mm/0.8" (Coil Diameter), the depth is 23mm.Single roll rubber surround. 90mm outside diameter and 74mm inner diameter of the surround.Made of high-grade paper. Strong enough to resist scratch and stretch, a sealed round edge would block the dirt and protect the coil.The cone(Diaphragm) is a front part of the loudspeaker. When the coil moves forward and back, drives the cone like a drum skin vibrating to make sound and into the airs.Feature. The Paper cone has a smoother high-frequency roll-off, but the paper cone can absorb moisture from the air, changing its mass and damping characteristics. 4" speaker paper cone with rubber surroundOverall Diameter: 98mm(About 4 inches)Voice Coil Diameter(Inner Diameter): 19.5mm(About 0.
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