At the Royal Eijsbouts bell foundry in Asten, Netherlands, the art of bronze bell making or bellfounding is based on 1,000 year old techniques that include using sand and molten wax.

Watch craftsmen sculpt the inner and outer moulds, pour the liquid bronze, and then fine tune the bell sounds in this clip from Discovery’s How Do They Do It.

Related vids: Handbell ringers perform “Married Life” from Pixar’s UP and more casting, including 1200F molten aluminum poured into an anthill and a dad that teaches his daughter how to cast a ring from scrap pewter.

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