These packages contain pieces of real tree bark in different sizes, that are perfect for simulating rocks in our dioramas.
They can be glued with PVA or CA glue. Then, they can be painted (I'd recommend painting them before applying the final color coat) and you can apply other effects over them like moss, rain marks, water, etc.
They come in different sizes for you to be able to model different types of rocks in your dioramas or vignettes.
We have to prepare each shipment individually as they are ordered, so allow it in 3-4 weeks to arrive in the USA/Canada (to be safe) and 3-6 weeks rest of the world, though they are usually delivered much faster.