Westone Earphones, Clear (78517) Westone True-Fit Technology: 50+ years with in-ear applications has yielded a low-profile, lightweight, universal earpiece for maximum comfort and in-ear coupling for dynamic transfer of sound. Balanced Armature Driver: Westones balanced armature drivers are significantly more compact and efficient than traditional dynamic drivers. EPIC Replaceable Cable: Westones robust replaceable cable is constructed of bifurcated, high-flex, ultra-low resistance tensile wire, reinforced with a special aramid fiber Designed and assembled in the USA Includes five sizes of Patented STAR silicone and five sizes of True-Fit foam assorted ear tips, mini-monitor vault and cleaning tool.