Black nylon plastic with a matte finish and slight grainy feel.
About this Product
This is the bottom part of the OpenPilot CopterControl case. You also need the top part (Case upper v1) and (optionally) the base (Case base 1 v1). More info here: http://wiki.openpilot.org/display/Doc/CopterControl+case
IMPORTANT NOTE: Due to some very slight dimensional differences, this case needs some minor modifications with a knife/file to fit the CC3D. A separate version is available for the CC3D.