White Labs WLP002 English Ale Yeast is a classic ESB strain from one of England's largest independent breweries. This liquid yeast is best suited for English style ales including milds, bitters, porters, and English style stouts. This yeast will leave a beer very clear, and will leave some residual sweetness. White Labs yeast is world-renowned for quality and innovation, certified kosher, GMO free, and subject to thorough quality analysis before being packaged. This yeast comes packaged in White Labs' PurePitch packaging using the innovative FlexCell process, which creates yeast that has never been transferred or exposed to the environment. The PurePitch packaging is recyclable, flexible material that allows for increased breathability, reducing the chance of gas buildup and maintaining the optimal environment for yeast.