I have always sung plenka, and not sung it in public since I had a wee snit tell me that it was 'penka' not plenka.

I'd bet she never played mabs in her life.

A plenka (aka plenky) is a big coloured marble, usually quite coarse looking and not always smooth on the surface. Most were one colour, but some had a spiral of colour on the surface - they were not transparent like the ordinaries, but often rather dull colours. I had one that was bright blue, which was unusual, they were Spangles old english colours. (Spangles were square sweets sold in tubes and which came in different types of flavours/colours.

Large ballbearings are bollies, and I had quite a collection of those. I was quite good at marbles and won quite a lot - so many that I kept them in three separate bags, for ordinaries, plenkas and bollies.