SCP-999 appears to be a large, amorphous, gelatinous mass of translucent orange slime, weighing about 54 kg (120 lbs) with a consistency similar to that of peanut butter. Subject’s size and shape is easily malleable and can change shape at will, though when at rest, SCP-999 becomes a rounded, oblate dome roughly 2 meters wide and 1 meter in height. The surface of SCP-999 consists of a thin, transparent membrane similar to that of an animal cell roughly .5 cm thick, and is highly elastic, allowing SCP-999 to flatten portions of its body up to 2 cm thin. This surface is also hydrophobic, although SCP-999 can willfully absorb liquids (see Addendum SCP-999-A). The rest of SCP-999's body is filled with a viscous orange substance of unknown chemical makeup, though it is capable of digesting organic materials with ease.