HAY BALLS 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. We also do large ones on special request and Rosie (in the den below), who has one of those, even likes to sleep in it! All our hayballs come tightly packed with TIMOTHY RICH HAY! Hayball "Medium":