The Sherman Firefly was a World War II British variant of the American Sherman tank, fitted with the powerful British 17 pounder anti-tank gun as its main weapon. Originally conceived as a stopgap until future British tank designs came into service, the Sherman Firefly became the most common vehicle with the 17 pounder in World War II.
Within the blister, as with a lot of FoW models, you get a resin hull and turret and metal tracks and accessories. Having constructed the Sherman I gave the model a white undercoat.
See the workbench feature on my Flames of War Sherman Firefly VC.