I would like to hold material down so it doesn't shift on the lightobject

I would like to hold material down so it doesn’t shift on the lightobject z table that has a pin bed made of “punk rock” clothing studs in the holes, I was curious if anyone has some good ideas for holding material down on this type of surface?

Rare earth magnets?

I think it has an aluminum bed, magnet does not stick

What are the punk rock studs made of?