Per 
Item #: SCP-5156
Object Class: Safe
Special Containment Procedures: SCP-5156 Is to be kept glass case, In 5x5x5 meters room made of steel, and iron. The room needs to have, An arcade machine and a vending machine. The machines must be changed every test from now and then to a new model.
SCP-5156 Must be guarded by 2 armed guards at all time, Because of small danger, SCP-5156 is to be closed by 1 lock. SCP-5156 is currently in Site-██ America.
Description: SCP-5156 appears to be a small token, That is used on arcade machines to play them, it has painted "1" on it. SCP-5156 is made of plastic iron and variety of known and unknown materials, SCP-5156 weight is changing every time it's used on different arcade/vending machine.
When SCP-5156 is used on arcade/vending machine SCP-5156 Changes itself, to fit to the machine, SCP-5156 appears to work on every arcade/vending even if the machine does not support tokens.
SCP-5156 changes its weight every time it's used as an arcade/vending machine, SCP-5156 Won't change itself as long as it's not used as a new machine.
However, it's not explained how SCP-5156 changes itself to fit into an arcade/vending machine, it's estimated that when used, SCP-5156 changes metal into liquid to fit to the machine, and then changes liquid to metal again.
Addendum: Note: It's confirmed that SCP-5156 changes its metal to liquid and then liquid to metal when put to an arcade/vending machine, We know this from a fact that if we put a microscopic camera to the coin input, We can see it clearly transform.
