Sony's dual-window cassette shell incorporates high and low elasticity materials to suppress vibration giving you clear sound reproduction.
Specially constructed of two separate materials featuring dual-windows which suppress vibration to produce clear sounds.
1.Absorbs external vibration originating from cassette player.
2.Absorbs internal vibration originating from tape pass.
High rigidity shell - Elasticity modulus: 40,000 kg/cm²
Dual windows - Elasticity modulus 20,000 kg/cm²