This tank paper model is a Pz.Kpfw. IV Ausf. D (Sd.kfz.161), a modification of the Panzer IV (Panzerkampfwagen IV or Pz.Kpfw. IV) Tank, a German medium tank during the World War II, the papercraft is created by iCardTanks, and the scale is in 1:50. There is another version available: Pz.Kpfw. IV Ausf. D Medium Tank Paper Model Ver.1.
You can download this papercraft model here: WWII Pz.Kpfw. IV Ausf. D (Sd.kfz.161) Tank Paper Model Ver.2 Free Download