However, the ?instructions? were nothing more than an ?exploded? version of the J-hook, with arrows, and letters corresponding to the parts list, which was okay, but there seemed to be parts in the diagram that weren?t in the box, and I never did figure out where the rubber strips were supposed to go. They are very narrow and the straps are different. Sometimes the sound is choppy, but not too often. I replaced them perfectly the first time and they look brand new again. They kept their shape and didnt relax too much and are comfortable all day. However there are less punchy on the kicks and tiny bit less bass. Viene con un estuche semi-rígido magnífico, que permite guardar y transportar los auriculares con total seguridad, detalle que es muy de agradecer al fabricante y en cuanto al servicio de atención al cliente, es bastante bueno, cuanto menos contestan rápidamente las dudas o reclamaciones que se les comunica. As for noise cancelling, it will not eliminate background / ambient noise. My biggest downfall is that when they shipped the lids and jars, the lids dont match the jar. btw changing the EQ sliders from lowest to max made no noticeable differences in sound but changing between the pre made sound profiles i do hear a very slight difference in bass.