This is a 4-pack of SMH-500 Closed-Back Professional Monitor Headphones from Senal. These headphones feature accurate sound, superior comfort, and durable materials. They are designed for studio and light field applications. The over-ear, closed-back design provides ample isolation to block out ambient noise on location, and prevent headphone leakage when recording in the studio. Their soft, replaceable ear cushions, lightweight design and refined sound ensure a comfortable listening experience; even during extended sessions.