Bose Small StayHear with Tips, Pair of 2 Compatible with Bose QuietComfort 20 Acoustic Noise Cancelling headphones, and Bose QuietComfort 20i Acoustic Noise Cancelling headphones. Proprietary design creates a gentle seal to facilitate full-spectrum noise reduction Spreads contact evenly across the ear to avoid pressure points Helps provide consistent audio performance while maximizing noise reduction Made of durable, washable silicone