From the Kelbourne website:

Built for real-life and made to last, Keystone is a classic, easy-care worsted weight yarn that perfectly blends practicality with purpose. Designed for knitters and crocheters who want dependable quality without compromising on values, Keystone is crafted from a thoughtful blend of 70% deadstock acrylic, and 30% North American wool. The result? A soft, sturdy, and versatile yarn that’s just as ideal for baby garments and dog sweaters as it is for heirloom afghans or community outreach projects.