What type of material is the container that is to the right of the napkins made of?
The container is made of metal.
    src        edge_attr  dst
0     4  to the right of   10
1     6   to the left of   14
2     7  to the right of   12
3    10   to the left of   13
4    10   to the left of    4
5    12   to the left of    7
6    13          wearing    4
7    13          wearing    0
8    13  to the right of   10
9    14   to the left of   18
10   14  to the right of    6
11   18  to the right of   14