What the heck are these!?

[Greeneman215]

I found these 2 pieces digging an old dump. The little square piece is quite a frequent find. I have found dozens in larger and smaller sizes. No clue what they are. Thank you for your help!

 

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[Tony in SC]

Is the first piece heavy/light/hollow? It resembles an old float. Tony

 

[Deftone]

Is that a Razer Krait 2013? This world is built on a lot of crap. Don't worry bout scrap.

 

[GatorBoy]

The second piece reminds me of the back of a clock