Inventory Items within RW Elephant are Items that are tangible goods (you can see and touch them) that are rented.
Inventory Items should be entered into RW Elephant as one rental unit. If, for instance, you always rent forks in groups of 12, enter "Jackson Fork (set of 12)" as one item. If, however, you rent the forks individually, you'd enter "Jackson Fork" as one item. If you have a total of 120 forks, in the first case, you'd have a total quantity of 10. In the second, 120.
Keep in mind that RW Elephant also has a Kits feature that allows you to sometimes rent individual Items together.