I bought these belts ( I also purchased the camel colored one) for my 4 yr old son. The buckles are made of stamped metal with a block of magnet either cemented or soldered into the male piece. I can not tell which method. While the idea is great, the execution I feel leaves something to be desired. I wish the buckles had been lacquered or enamel baked. Something to add a more polished feel and look to the whole thing. And because the buckles are made with stamped metal, the edges on the buckle loops are rough which makes adjusting the width a clumsy affair. The beige belt came with a locking snap with teeth to adjust width while the black one came with a simple double loop slide for adjusting width. While I feel the overall construction is clumsy and sloppy, it does feel sturdy. Guess I'll never know because I'm sending them back. I loved that these were made in the USA. So sad to have to send them back.