The stamps in the pack are 4 Singapore stamps that depict scenes of the local wet market. Unlike supermarkets found in the West, wet markets are open air concept markets that was is still very much prevalent in the East. The wet floors due to melted ice or washing gives rise to their names - wet markets.
Even as Singapore has developed, there has been a conscientious effort made to keep these wet markets. Most people now do their grocery shopping in supermarkets. But there are still times when people will turn to the wet markets. Not necessarily because it is cheaper. But because it is at times more convenient.
