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LEGO on Twitter: "@jnthnjffris This is a weight brick. Used as counterweight in the 8868 Air Tech Claw Rig/Materials Handler 😎" / Twitter
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What is it ? There is something heavy inside like a battery ? Or some kind of metal , magnet maybe . : r/lego
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BrickLink - Part 73090a : LEGO Brick, Modified 2 x 6 x 2 Weight - Bottom Openings, Center Seam on Ends [Brick, Modified] - BrickLink Reference Catalog
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