Chevy LS1 Underdrive Steel Elastic Harmonic Damper Balancer Only (1/2) they utilize a cotton gauze

they utilize a cotton gauze with aluminum mesh construction

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Chevy LS1 Underdrive Steel Elastic Harmonic Damper Balancer Only (1/2) they utilize a cotton gauzeSpeedmaster K1045 steel enclosed elastic dampers are tested to 12,500 RPM for explosion proof racing application. The "S" shape gap between inner and outer ring is press inserted with sulfated elastic rubber to ensure the damper will not disintegrate under any circumstance. All dampers are tested to withstand 15 tons press force without separation or deterioration.