RealCup™ single serve cups have the Flavor Max™ Filter to give consumers the maximum flavor from their favorite coffees and teas, hence the name. Plus, our single serve cups are compatible for use in the Keurig® K-Cup®* brewer. Unlike other filters, the Flavor Max™ Filter uses non-woven fibers to make sure all the rich flavors, colors and aromas end up in the consumer's cup.