A search for "vintage marbles" on eBay will get a lot of results, this is one of them. They look like ordinary marbles to me, I guess marbles haven't changed much over the years. We played with them a lot when we were kids. Technically they were my brother's marbles, I guess they were not a girl's toy. I never knew the proper rules of marbles, but we'd play with them in the dirt and driveway anyway.