Answer:
Each of these ends in a kettle full of precious metal and the double variety is quite awesome
Though easy to spot, when allowed to plume, It is hard to see, when held in a room.
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?
Long and slinky like a trout, never sings till it's guts come out.
Something wholly unreal, yet seems real to I. Think my friend, tell me where does it lie?
They are many and one, they wave and they drum, Used to cover a state, they go with you everywhere.