Imported Hop Pellets All one ounce pellet hops are packaged in air-tight bags to insure you the freshest product available. The plant part used in brewing beer is the hop flower, a delicate, pale green, papery cone full of perishable resins. They give a beer bitterness when used early in the brewing process, and aroma when added at the end. As a bonus, hops are a preservative, and extend the life of beer.