Information from Oblotzkys site:
"The Aurora Input Series is a modern take on the classic custom keyboard design. It features slim bezels and iconic 'handles', and improves on a number of aspects to bring the aesthetic many of us love to a whole new level. While the case consists of a top and bottom piece milled from aluminium, it carefully hides the seam where these parts meet on its back and bottom sides, resulting in a gorgeous look all around. The typing angle is 8 degrees. The bottom part of the case holds a massive weight in place which clocks in at around 1.5 kilograms. It is machined from a solid block of stainless steel and finished off by bead-blasting its surface."