Pre-Order Now:br Drawing on expertise learned from building exceptional loudspeakers, JBL engineers created lightweight, comfortable headphones that deliver signature JBL sound. The J33a's premium, nickel-coated transducers generate smoother high frequency response and JBL Pure Bass that is deep, powerful and accurate. So you hear the truth from your music. Metal strain-relief anchors built into the rear housings improve durability and reduce resonances. Three pairs of silicone sleeves are included for optimal comfort and noise reduction. An in-line microphone lets you take calls without taking the headphones off.