item instances or items instances?

I’m making a game that has items inside it and each items has its own instances. Then I have a DB table that contains those instances. What should I name it to properly indicate my case? ItemInstances or ItemsInstances? Thanks!

Edit

My table might looks like this:

id | itemId | location
1  | 1      | New York
2  | 1      | San Fransisco
3  | 2      | New York
4  | 2      | New York

So this table can contain any type of items with possibility of multiple amounts (instances) of each items.