Marbureka Marble Run - What size spare marbles?

[Saffron]

We've lost our marbles! (Literally and figuratively, I'm sure.)

Does anyone know what size marbles to use with Marbureka Marble Run? We've tried a standard size glass marble, and it was too big. I looked online for Marbureka spare marbles. It seems they only come with the whole set. Grrr.

[Saffron]

Just discovered that Hungry Hippo marbles fit the Marbureka marble run (a little smaller than standard glass marbles)! :)