These pro4/aa headphones were introduced in 1970s are recognized as the first dynamic headphones to achieve a full frequency range. Closed-back around the ear design for high noise isolation. Features a heavyduty 8 foot coiled cable. They are known for being quite heavy, weighing approximately 22.6 ounces. A classic studio headphone perfect for collectors! Works great, normal wear, no rips. Please see pictures for more details!