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I own a few bricks that contain a weight inside of them. 52g according to Lego.

What exactly is inside of these bricks that makes them heavy?

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Are you talking about these lego train weight parts ? –  Riduidel Oct 26 '11 at 6:59
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3 Answers

up vote 19 down vote accepted

I did the unthinkable! ...I had to know.

I opened one of my two weighted bricks. One of the two ends has a glued on cap that I've cut around using an utility knife.

enter image description here

The piece of metal it contains fit almost perfectly in the cavity. I don't know metals but it has a rainbowish kind of sheen to it. Here's a close up:

enter image description here

I'm now gluing it back with super glue.

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+1, for defacing a LEGO brick to provide an answer. I imagine you could weigh it to find it's mass. –  Ambo100 Nov 22 '11 at 16:35
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Since when is defacing a LEGO brick worth +1? Heretic! –  Joubarc Dec 6 '11 at 10:43
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Makes sense that these would be galvanized steel since they were often used to balance the floating boats (e.g. 314, 4005, 4010, 4025, etc.) and could be reasonably expected to get wet and rust leaking out of the brick would look weird. –  Robert C. Barth Feb 8 '12 at 17:59
    
I literally gasped when I saw this. –  Matthew Crumley Mar 1 '12 at 15:40
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I'm fairly sure it's one or two pieces of iron, but I would need to check with someone who actually opened one. You can easily check that it's a ferrous metal if it attracts magnets.

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Non-ferrous metals aren't magnetic... so a lack of attraction doesn't rule out the possibility of a metal being used ;) –  Zhaph - Ben Duguid Oct 26 '11 at 15:17
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Indeed, I oversimplified it, I guess I'll edit that in. But magnetic attraction will confirm it's a ferrous metal, and since I was pretty sure it's iron (as confirmed by oezi), I didn't want to bother thinking about other metals. –  Joubarc Oct 27 '11 at 7:32
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i had two if these bricks in red, one is broken (one of the side-caps droped of): theres just a piece of galvanized iron/steel in it.

my blocks are bought about 19 years ago, so maybe they changed the weight to an other/cheaper material in the meantime, but i don't think so.

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This seems like it's correct. I'm going to do what Zhaph said and test it with a magnet. –  Pubby Oct 26 '11 at 18:43
    
i'm not 100% sure it's iron/steel, but it pretty much looks like because it's galvanized, wich won't make much sense on other metals. i'm looking forward to the results of your magnet-test. –  oezi Oct 26 '11 at 20:34
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