Tree sticks are made from two year old willow rods. These very chunky sticks are great for really large drawings and are strong enough to use on all kinds of surfaces.
Please be aware that willow charcoal is a completely natural product made simply from the willow grown on a farm. Therefore the sizes of the charcoal sticks are approximate measurements, one end of the charcoal stick will differ in size to the other end.
Look very carefully at a stick of willow charcoal and you will see the marks where the leaves have been removed from the willow stick and also the soft central pith at the core of the stick.