4+4+4 Balanced Three-way Frequency Crossover Pure pursuit of uniform energy distribution and seamless sound connection. Four-in-One Large-Sized Bass Module Bass Balanced Armature Driver Equipped with an Open-back Stainless Steel Diaphragm. Customize Lightweight Aluminum-magnesium Alloy Diaphragm Two Sets of Two-in-One Composite Mid-Range Balanced Armature Drivers. Four-in-One Treble Module Miniature Aluminum-magnesium Alloy Diaphragm Balanced Armature Drivers. 0.78 2pin Interchangeable Cable Design Includes Mixed Earphone Cable with Interchangeable Plug