Object Class: Euclid
Special Containment Procedures: SCP-XXXX is to be kept in a sound-proofed, concrete containment chamber (in site 17) measuring 5m x 5m x 5m. Containment chamber is to be inspected every month and repaired if necessary. If SCP-XXXX is to breach containment, all personnel in site 17 are to be evacuated, and all personnel in surrounding buildings are to stay away from the entrance to site 17 or also be evacuated (depending on the importance of the activity they are partaking in). After evacuation, designated MTF units must quietly make their way to SCP-XXXX's containment chamber, then make a noise louder than 75 decibels to lure SCP-XXXX back into the containment chamber. Only personnel with clearance of level 3 or above are allowed to enter the containment chamber, but any personnel are allowed to view the camera feed from the containment chamber.
Description: SCP-XXXX appears to be a collection of three (3) spherical objects constructed of an unknown material that at this time cannot be destroyed. They measure 4.67 cm in diameter. These obscure spherical objects react violently to noises above 75 decibels by rapidly vibrating and bouncing off of the surrounding surfaces at a speed of 50m/s, gradually getting closer to the origin of the sound. Whilst the noise continues, the spheres begin to slowly increase in size, causing more destruction in the room it is bouncing in [See Experiment Log 233-E]. The objects were discovered in ██████, America in 19██ by a toy shop - a new arrival of a box of stuffed teddy bears burst its confines as a forklift truck was being operated in the warehouse (this is assumed to be the work of SCP-XXXX and its violent reactions, as it is later found that they were also placed in the box, but this mysterious happening has not yet been explained).
Experiment log: 233-E:
1:34 - The sound-proofing film is removed from the outer layer of the containment chamber.
1:42 - D-3951 is given a pair of cymbals and instructed to clash them together continuously.
1:43 - SCP-XXXX enters its "active state" and starts to bounce off of the walls of its containment chamber.
1:49 - SCP-XXXX expands to 6cm in diameter - density increases. Cracks start to show on the walls of its containment chamber.
1:55 - SCP-XXXX expands to 7.5cm in diameter - density increases further. Dents start to appear in the walls of the containment chamber.
1:56 - SCP-XXXX bounces off of a wall and hits the camera, causing it to malfunction and break.
[D-3951 is then instructed to stop clashing the cymbals. Containment chamber is repaired. Sound-proofing film is replaced on the outside of the containment chamber].