What are the gray glasses made out of?
The glasses are made of metal.
    src        edge_attr  dst
0     0   to the left of   12
1     0   to the left of   10
2     1  to the right of   10
3     2  to the right of    8
4     2  to the right of    7
5     3  to the right of    7
6     3   to the left of    5
7     3  to the right of   13
8     3  to the right of    8
9     4  to the right of   13
10    4  to the right of    8
11    4  to the right of    7
12    5  to the right of    3
13    5  to the right of    7
14    5  to the right of    8
15    7   to the left of    2
16    7   to the left of    3
17    7   to the left of    9
18    7   to the left of    5
19    7   to the left of    4
20    7   to the left of   10
21    7   to the left of   11
22    8   to the left of   12
23    8   to the left of    5
24    8   to the left of    9
25    8   to the left of   11
26    8   to the left of   10
27    8   to the left of    3
28    8   to the left of    2
29    8   to the left of    4
30    8          wearing    0
31    9  to the right of    7
32    9  to the right of    8
33   10  to the right of   13
34   10   to the left of    1
35   10  to the right of    0
36   10  to the right of    8
37   10  to the right of    7
38   10          wearing   12
39   11  to the right of    8
40   11  to the right of    7
41   12  to the right of    0
42   12  to the right of    8
43   13   to the left of   10
44   13   to the left of    3
45   13   to the left of    4