How are glass marbles mass produced?

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I watched a video where a glass blower made a (larger) glass marble by twisting in all kinds of different colors, but it looked very time consuming and I know there’s no way they do this for the millions of marbles they mass produce for sale for super cheap. So how exactly do they mass produce these things with all the twisty colors in them and whatnot?

In: Engineering

The first half of this video shows the machine which rolls hot chunks of glass while they cool to round them. [https://youtu.be/kPtzD5uRQCc](https://youtu.be/kPtzD5uRQCc)