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.

Subject’s temperament is best described as playful and dog-like: when approached, SCP-999 will often react with overwhelming elation, slithering over to the nearest person and leaping upon them, “hugging” them with a pair of pseudopods while nuzzling the person’s face with a third pseudopod, all the while emitting high-pitched gurgling and cooing noises. The surface of SCP-999 emits a pleasing odor that differs with whomever it is interacting with. Recorded scents include chocolate, fresh laundry, bacon, roses, and Play-Doh™.

Simply touching SCP-999’s surface causes an immediate mild euphoria, which intensifies the longer one is exposed to SCP-999, and lasts long after separation from the creature. Subject’s favorite activity is "tickle-wrestling", often by completely enveloping a person from the neck down and tickling them until asked to stop (though it does not always immediately comply with this request). Though injuries may occur, SCP-999 has never been found to purposefully attempt to harm others, and will immediately back away and contract its body into a quivering mound while gurgling in a matter similar to a whimpering dog, seemingly "apologizing" for hurting someone on accident.

SCP-914 is a large clockwork device weighing several tons and covering an area of eighteen square meters, consisting of screw drives, belts, pulleys, gears, springs and other clockwork. It is incredibly complex, consisting of over eight million moving parts comprised mostly of tin and copper, with some wooden and cloth items observed. Observation and probing have showed no electronic assemblies or any form of power other than the “Mainspring” under the “Selection Panel”. Two large booths 3mx2.1mx2.1m (10ftx7ftx7ft) are connected via copper tubes to the main body of SCP-914, labeled “Intake” and “Output”. Between them is a copper panel with a large knob with a small arrow attached. The words Rough, Coarse, 1:1, Fine, and Very Fine are positioned at points around the knob. Below the knob is a large “key” that winds the “mainspring”.

When an object is placed in the Intake Booth, a door slides shut, and a small bell sounds. If the knob is turned to any position and the key wound up, SCP-914 will “refine” the object in the booth. No energy is lost in the process, and the object appears to be in stasis until the Output Booth door is opened. Intense observation and testing have not shown how SCP-914 accomplishes this, and no test object has ever been observed inside SCP-914 during the “refining” process. The process takes between five and ten minutes, depending on the size of the object being refined.