Christmas tree flocking is typically made of shredded plastic or PVC materials, which can be sprayed onto a tree to give it a snowy or snowy-like appearance. The flocking is often sprayed on the tree using a special machine that sprays the flocking in a fine mist, creating a fluffy, snow-like texture. The flocking is often colored white, but it can also be available in other colors, like blue or red, to give the tree a more festive look. The flocking is typically non-toxic and safe for use around children and pets.