This silicone headband cover is designed to protect your headphone headband from daily wear and damage. It is compatible with JBL Tune 700BT, 710BT, 720BT, 750BTNC, 760NC, 770NC, 670NC and 660NC headphones. Made of soft, flexible and skin-friendly silicone, it fits closely to the headband to help reduce friction, scratches and peeling while keeping it comfortable to use. It helps block sweat, oil, dust and dirt to extend the lifespan of your headphones. The material is durable, reusable and easy to clean, suitable for gym workouts, outdoor activities, commuting, gaming and long-time headphone use. Please ensure the zipper head is fully inserted before pulling, and contact us if you encounter any zipper or quality issues.