The natural warmth and beauty of wood is available in a variety of types and species. The interior material of a wood casket is typically either velvet or crepe. The classification "hardwood" simply means that the wood comes from a leaf-bearing tree. "Softwood" comes from the needle or cone-bearing trees. Therefore, designation as a hardwood is not determined solely by the consistency or surface hardness of the wood itself, but the species of the tree from which it came. Cost can vary depending on whether the sides of the casket are constructed from solid wood or a veneering process has been utilized.