The Nesom Distributing Envigo (Formerly Harlan) Teklad Adult Rat Food Diet is a high-quality, nutritious diet that is perfect for any rat or mouse. This diet is made with a proprietary formula that is both balanced and consistent, and it is repackaged by Nesom Distributing for your convenience. The Nesom Distributing Envigo (Formerly Harlan) Teklad Adult Rat Food Diet is globally recognized as one of the best quality rodent diets available, and it is an excellent choice for any rat or mouse owner.