They are DWORD.
For example, if the item ID of FATED STAR FRAGMENT is 1000
Adding 160 to it = 1160, is the item ID of Guiding Light Staff
Add another 160 = 1320 is the item ID of Guiding Light Sword
So on and so on until 3560 which is the item ID of Luring Shadow Hammer
After this, if you try and inject the next item, the game will crash. Maybe because Luring Shadow Hammer is the last item in that group.
Another example is if the item ID of RED CARD is 2000, if you add 160 to it, you won't get anything. But if you add 320, you will get the item ID of WHITE CARD
Add another 320 and you get the item ID of BOLD PULSE. And then add 160 to get the item ID of SKIP TICKETS
There are some areas where adding 160 gives you the next item and some areas where you have to add 320.
Sometimes if you get an item ID that doesn't point to anything, the game crashes.