Stuffing

Stuffing (also called cotton, fluff, and fluffing) is the material that is used to make pillow blocks, and items. Until the Battle Craft Update, they could only be refilled to a max of 5,000 stuffing, but now with the new Max Stuffing Game Rule, you can get as much as 50,000 stuffing.
Stuffing can also be regenerated by using a cotton machine, cotton plants, or eating other blocks. It can also automatically generate if there is a cotton generator in the map.
When a Health rule block is in a map, stuffing can be taken away by weaponry items like a bats, guns, and bombs. These can take anywhere from 100 stuffing to 1000 stuffing.