What is the tray made of?
The tray is made of metal.
    src        edge_attr  dst
0     1  to the right of    5
1     1  to the right of    3
2     1  to the right of   10
3     1  to the right of    2
4     2   to the left of   15
5     2   to the left of    1
6     3   to the left of    6
7     3   to the left of   15
8     3               on    8
9     3   to the left of    1
10    3  to the right of    5
11    4             near    8
12    4  to the right of    5
13    4  to the right of   10
14    4               on    2
15    5   to the left of    3
16    5   to the left of    4
17    5   to the left of   13
18    5   to the left of    7
19    5   to the left of    6
20    5   to the left of    8
21    5   to the left of    1
22    5   to the left of   14
23    6               on    8
24    6   to the left of   15
25    6  to the right of   10
26    6  to the right of    5
27    6  to the right of    3
28    7  to the right of   10
29    7  to the right of    5
30    7               on    8
31    8  to the right of   10
32    8  to the right of    5
33    8             near    4
34   10   to the left of    1
35   10   to the left of    4
36   10   to the left of    8
37   10          wearing    0
38   10   to the left of    6
39   10   to the left of    7
40   10   to the left of   15
41   11   to the left of   13
42   13  to the right of    5
43   13  to the right of   11
44   13  to the right of   14
45   14  to the right of    5
46   14   to the left of   13
47   15  to the right of   10
48   15  to the right of    3
49   15               on    8
50   15  to the right of    6
51   15  to the right of    2