Prestige Custom IEMs are the pinnacle of functional art. Rather than the typical method of casting acrylic shells using molds created from your ear impressions, Prestige Customs are carved from solid materials. Each one is a one-of-a-kind hand crafted work of art, that captures the beauty of the materials they are made from. The Sultan is Nobles award winning IEM, featuring one dynamic 10mm driver, 4 BA drivers and 2 electrostatic drivers. Build time is 6-8 weeks after receipt of your ear impressions.