The 6.3mm stereo jack can be used with things such as instruments and DJ kits as well as other audio equipment, whereas the 3.5mm adapter enables you to connect the headphones to things such as your iPod, computer and other gadgets utilising the standard 3.5mm port.- Design -The headphones weigh just 259g with dimensions of 24.1 x 20.3 x 10.2 cm.