Made out of polished, high quality aluminum, the ROK Espresso Maker will serve you with a warm cup of coffee through a manual, non-electric design. The maker is eco-friendly where the only power used is to boil the water for your espresso. You can not only use it at home but also while you’re camping or riding a boat. The lowering of the lever arms will help you achieve the right pressure required to prepare the espresso. This air is trapped which will then force water through the ground coffee at a high pressure.