VSD2 Enhanced Bass Hi-Fi High Fidelity Professional Quality Stereo Inner-Ear Earphones. VSD2 is good for pop, vocal and rock music. VSD2's strengths lie in mid frequency, low frequency, resolution, sound field. Ring structure designed to eliminate the extra noise, the sound quality is more stable. Powerful low-frequency delicate vocals give you more real melodies. Quality headphone cable, staggered treads design Composite diaphragm. Excellent Isolating effects. High quality OFC audio cable. Equipped with a variety of sizes of eatips.