The Blood upgrade kit has two heads built into one, by just rotating the head and putting the helmet back on you get a different face! Blood's two blades are rigid ABS plastic that are chrome plated in a tough, durable finish. The proportions for the swords are more realistic as well as the tank turret in tank mode! The swords may also be used with the original Pretender Bludgeon figure, making it a great set for either version of the figure.