The product is a set of  three New Old Stock Germanium transistors, with two of them having unknown brand and one being from Texas Instruments. These NPN transistors have three pins and are quite likely to be used in electronic equipment and supplies, specifically in the realm of semiconductors and active components. The Germanium transistors, with gold plated leads, featured in this listing are likely to have a nostalgic appeal to collectors or enthusiasts of electronic components from the past. These transistors were purchased at an estate sale and have not been tested.  I am selling these As Is.