stainless steel on the outside and silicone padding on the inside, with strategically located cutouts for wireless signals and heat emissions to get through. You can flip the front plate open, turning it into a rather outsized clamshell, or you can just talk with the lid closed, it's all up to you. Aluminum and engraving options (how about "my other phone is a Vertu"?) are also available with each case costing a slightly spendy $95. See more of it in the gallery below.