Made from "buff" willow (boiled & peeled).
These are made from bought-in willow, which is likely to have been treated during it's growth.
Due to the amount of tannin out of the bark that has accumulated in it during the boiling
process, they are less likely to be chewed though.
These balls have larger gaps than the normal balls
and are therefore more suitable to be filled with hay -
providing nutrition and entertainment at the same time.