Here we have a pair of RHA CL750 in-ear headphones. These are high impedance headphones and are meant to be used with an amp. They originally came out at the same time that RHA released their DACAMP L1 and were meant to be paired with it. They will work well with any quality portable amplifier. The earpods are made of stainless steel and are fitted with high quality oxygen free copper cables with a stainless steel plug. Build quality is top notch on these monitors, like all RHA products.