The Keurig Reusable K-Cup Filter is a refillable single K-Cup designed specifically for Keurig machines, including the B30, B31, B40, B60, and B70 models. With a reusable feature, this filter allows users to continue using their favorite Keurig coffee machine without the need to constantly purchase new disposable K-Cups. Made by the brand Keurig, this filter ensures compatibility and high-quality performance for a seamless brewing experience.