SCP-1903 is a human female (previously known as Jackie Barter). SCP-1903 is 1.62 meters tall, has dark, claw like hands and feet, wears novelty bunny ears, and has the appearance of wearing a paper mâché-styled rabbit mask. SCP-1903 produces mercury and blood through the pores of its hands and feet, and its 'mask' is composed of skin cells, a plastic-like material, blood, cotton fibers, and trace amounts of mercury. SCP-1903's left eye has been removed.