Any items that are small but weigh a substantial amount?

I have an old iphone which I store my money inside (notes only) because it was broken beyond repair and it is an easy, un guessable place to store it. But after taking out the battery it obviously weighs a lot less, I want it to feel like a normal iphone, what can I put inside it that is small but weighs a substantial amount?

For something dense and flat, try drapery weights. You can probably get just a few for little or nothing from a place that sells draperies.

http://www.wawak.com/products/product.cfm/pid/14503

LEAD piece.

Either Diamonds or depleated uranium?

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