Woodpecker Fi-E & Fi-P Endo Gutta-Percha Obturation System CordlessWoodpecker Dental Endo Fi E & Fi P Cordless Gutta Percha Obturation System. The Fi P (Heat & Packing Pen) and Fi E (Electronic Filing Pen) work in conjunction with each other for the ultimate gutta percha obturation system for your root canal procedures. Note: The difference between the Fi E gutta percha dispenser and the Fi G gutta percha dispenser is that the Fi G is a gun type handle that is squeezed, where the Fi E is an electronic pen type