Metal.

There's a Romanian gypsy woman who comes to the gate of this site every week or so asking for "metalmetal". If we have any scrap she drags it out and balances it on a beaten up old pram, no matter how big and unwieldy, and wheels it away.

Occasionally she'll do her best to convince us to let her take non scrap items, such as the client's sculptures, or newly delivered steels. She'd have trouble with these sheets of reinforcing, each one is 2.5m high and 5m long and weighs a ton; and if you could lift one by yourself it turns to very heavy jelly in your straining arms. I bet she'd manage pretty well though.