The Senpai

Item #: SCP-????

Object Class: Safe

Special Containment Procedures: SCP-???? must be contained in its original plastic tube, but may be taken out of its original box containing the tubes after clearance that the tube is completely undamaged. The plastic tube that holds SCP-???? may not be altered in any way, nor can the top be taken off of the tube, however SCP-???? must be put in a fitted locked box.

SCP-???? is to be monitored by a camera at all times.

Each item of SCP-???? must be handled one at a time. No tests on SCP-???? may last longer than 10 minutes; if a test is to reach or exceed 10 minutes, SCP-???? must be contained in its tube immediately.

Any entity attacked by SCP-???? must be immediately terminated.

No tests are currently permitted to be run on the interior of SCP-????, but tests on the exterior sides may be done following the previous precautions.

Description: SCP-???? is a set of 72 fluorescent yellow “Wilson” tennis balls, contained in 24 separate plastic tubes. Each tennis ball measures a 6.86 centimeter diameter. The tennis ball tubes are currently in fittec cases, packaged in the original box, and that box is contained on site 23-D.

After testing a normal tennis ball to SCP-????, it has been concluded they have the same color, dimensions, and exterior material. Differences included elasticity, bounce height, and interior material. No more interior material tests are permitted (see addendum).

When SCP-???? is released from its tube, after about 10 minutes, it will teleport inside the nearest persons skull, and proceed to mutilate their insides over the course of about 4 minutes and 10 seconds. After the inside of the victim's head is completely hollowed, it waits inside for approximately 30 seconds, and continues to the next victim.

The anomalous properties of SCP-???? were first discovered on May 19, 2007, when declassified government footage, and witness accounts revealed a husband and wife going to a local park in New Jersey to play tennis. They brought with them 3 out of the 24 known tubes. They opened the first tube and about 10 minutes later, all of the tennis balls disappeared, and are suspected to have re-appeared inside of someone's head. People frenzied, as others dropped to the ground, with seemingly no reason. An unknown person called over a police squad, which came over to stop the scene.

The police tracked the owners of SCP-???? back to their house, and safely claimed and transported each entity to site 23-D, where they are currently being contained. It has been attempted to contain them in substances such as other plastics, metals, and liquids, with no success. Short attempts to terminate SCP-????, using fire, and crushing power have yielded no positive results, no attempt has been longer than 10 minutes.

Addendum: Interior test failure.

Interior testing had been cleared, and Dr. Hal has been chosen to conduct testing. Feb 17, 2009, testing starts. Dr. Hal opens the tube. Dumps 3 tennis balls out, and puts 2 back in. One tennis ball remains still on table for 10 seconds, so testing is clear to commence. Dr. Hal cuts into entity, and looks inside. He writes down some notes, which appear to say "Black inside, made of some kind of thin metal. It's probably tin." Dr. Hal looks back at SCP-????, to see the tennis balls hole close up. He makes another slice in. He touches the inside with his tool. Entity sucks him and the tool inside of it, along with his materials nearby. Entity closes up.

Dr. Hal was never seen again. Interior testing is now suspended.

-Report filed by [REDACTED]