Grado GH4 is an open back wired headphone, a Limited Edition, replacing the GH1 and GH2 models. GH4 uses Norwegian Pine wood for the housing, providing a warm and detailed housing that is a perfect match for Grado's drivers. GH4 uses the L foam pads, so they sit off the ears slightly.
The cable is Grado's thicker 8 conductor cable with a 3.5mm plug + 6.5mm adaptor and the headband is a padded thick black leather. Foam pads are replaceable. GH4 are Grado's typical easy to power design, so you can get great results without much power - just feed them the best quality signal you can.
*If ever needed in the future, all Grado headphones can be repaired by Grado Canada using original parts for a reasonable, fixed price.