This is a piece of "pegamoid" or cockpit coaming that, once it had been stuffed with horsehair, was used to form the padding over the edges of the aluminum panels in the front of the cockpit on Fokker and other aircraft.  This piece came along with several pieces of fabric from a Fokker D.VII so it may be from that aircraft.  Dan-San Abbott explained to me in 2003 on The Aerodrome forum "they were sewn to the right and left panels through holes drilled along the edge of the aluminum panels." You can see an example of original pegamoid as used on a Fokker D.VII in the photo below of a D.VII at Knowlton.  This is a single piece and it measures 44 inches or 112 cm  long.