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EarTlogis Replacement Ear Pads for Sennheiser HD 300/ 400S/ 4.20/ 4.30/ 4.40/ 4.50 BT BTNC/ 4.40BT/ 4.50BT Earmuff Cover Cushion - AliExpress
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Amazon.com: Sennheiser Professional HD 300 PRO Over-Ear Broadcast Headphones,Black : Musical Instruments
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SENNHEISER HD 300 PROtect - Monitoring headphone with ultra-linear response (64 ohm), 1.5m cable with 3.5mm jack and on/off selectable ActiveGard limiter. Includes (1) HD 300 PROtect headphone, (1) 1.5m cable with
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