This matched pair of vacuum tubes from KR Audio is a must-have for any vintage audio enthusiast. With a model number of 300b, these tubes are guaranteed to provide a high-quality audio experience. Made by a top brand in the industry, KR Audio, these tubes are sure to impress. These tubes are a unit type, come in a quantity of two, and were manufactured in an unknown country/region. They are perfect for use in vintage and new audio electronics. Don't miss out on the opportunity to add these tubes to your collection.