There were 2 types here when i was younger: glass+colored swirls , also off white bigger marbles(kinda looks like made of marble but im not sure it was). We used to hit n break the iff-white type a few times, but i dont rmbr the glass ones being broken-maybe cos it was harder to strike tat smaller target with enough force. After some time tho, everyone stopped. I think in primary(equivalent to grade school) we had exams to determine which school to go to next so we all focused on tat n i dont rmbr playing with marbles after tat.