Huge value-for-money studio headphone 40mm dynamic neodymium drivers Great clarity and balanced sound Rugged and stylish look Comfortable headpiece and ear pads Shure SRH840A-EFS Study headphones (Black/Gold) Great value-for-money studio headphone from Shure. Well-tuned 40mm ...Huge value-for-money studio headphone 40mm dynamic neodymium drivers Great clarity and balanced sound Rugged and stylish look Comfortable headpiece and ear pads Shure SRH840A-EFS Study headphones (Black/Gold) Great value-for-money studio headphone from Shure. Well-tuned 40mm dynamic neodymic driver provides a natural and balanced frequency response with minimal noise.