I really don't know, I bought them at my local electronic shop and now they have a different one, like brown... And, their provider doesn't have the green one anymore...

A few years ago it was like red/pink, then this green/yellow and now brown... I searched eBay but no one is selling epoxy boards...

I'll continue looking, let me know if you see something like the one on the picture...

Thanks!

Daniel.

PS: I'm the professor...