Smart Paint, that brings back memories.
Sold in 1998-99'ish (could be wrong)
Smart Paint was RPS rebranded paint specifically designed for the old Shocker 4x4. It was medium bore, bright green fill, and ultra fragile shelled.
The rumour was that they stopped doing it as it was very popular and was sold cheaper than the RPS tournament stuff at that time.
I remember finding my old brix was quite hard on it, and bursting 1 in 10 on the bolt.
Now dont go asking any questions about Forest paintballs
Edited: De-typo'd