The unique diamond-cut design further enhances its visual appeal is the personalized dual-sided infinite mirror cap with customizable infinite mirror RGB lighting. The powerful fans can operate from just 500 RPM for virtually silent operation, to 2000 RPM for big airflow at the expense of overall noise output. EPDM (ethylene propylene diene monomer) for durability and flexibility Fan Bearing Type: Loop Dynamic Bearing (LDB) for long life and smooth operation