Grado Labs is a manufacturer of open-air grado headphones. All Grado headphones use Grado’s vented diaphragm technology, dynamic transducers, open-air, “circled” 40mm driver-oriented supra-aural earcups an Impedance of 32 ohms, and a Sensitivity level of 98 dB.

Grado headphones have a non resonating air chamber, it comes in two version of aluminum and wooden. These headphones use high energy magnets like neodymium for each side of the earcups.

One thing that is unusual about grado headphones are that they come in only one color with the except of iGrado. If you are looking for grado headphones then check out wize.com; they provide a lot of review, rating and comparison of grado headphones. They have a special wize ranking system for people to make an easy decision over which one is better at what.