Recs.
Updated
The J4 gives an impression of durablity, as the earpiece shells are made of aluminum, complemented by a Kevlar reinforced cable. Sound has good detail on the top-end, along with powerful and punchy bass.
SpecsUpdate
Pros

Pro Durable Kevlar-reinforced flat cables with strain relief
J4 cables are reinforced with kevlar to resist breakage. The flat design helps prevent kinks, as the cable coils rather than twisting or bunching. Also, tough and flexible reinforced exoskeletons protect the cable connections and joints.

Pro Detailed sounding highs with punchy bass
Overall sound is quite bassy, with low end that is very punchy and fast, so it does not muddy up the music. The mids are slightly recessed, though the vocals can still be quite clearly heard as the bass does not overpower it. Highs on the other hand sound pretty good as they are clear and detailed without getting harsh.
Pro A good number of accessories are bundled
With the J4, you get an EVA foam carrying case for even more protection and convenience when bringing these on the go. Also, there are two sets of silicone ear tips: 3 pairs of single flange tips as well as 3 pairs of double flange tips. A shirt clip is also included.
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