Ground hook : light aluminium alloy compression casting,

Pole : use light epoxy resin  to produce,high strength,ultralight.

The baling wire : electrolysis copper wire.

The protective covering : use plastic that applicable temperature scope : plus/minus 40 degree 

Earth/ground wire is an additional wire for safety, it is used to ground metal parts of devices and electrical wiring so thay can't become "live" (dangrous to touch)