The compact ATH-CKS55BK Solid-Bass in-ear headphones deliver remarkably full and textured bass. A-T"s innovative Dual Chamber Mechanism extends bass response without compromising mid- and high-frequency content. A two-position post adjusts the earpieces for better fit and sound isolation. Advanced 12.5 mm drivers reproduce powerful sound and efficient signal transfer. A carrying pouch and ear tips (XS/S/M/L) are included.