1、This product is made of high quality materials and is durable and practical 2、A transistor is a basic semiconductor device that controls current, and can also be used as a non-contact switch 3、This set has a total of 15 commonly used triodes, a total of 150 triodes, to meet your various needs 4、There is a label on the box that makes it easy to determine which type of triode you need 5、All triodes are well packaged and assembled in a transparent box for easy storage Features: This product is made of high quality materials and is durable and practical. A transistor is a basic semiconductor device that controls current, and can also be used as a non-contact switch. This set has a total of 15 commonly used triodes, a total of 150 triodes, to meet your various needs. There is a label on the box that makes it easy to determine which type of triode you need. All triodes are well packaged and assembled in a transparent box for easy storage. Specifications: Condition: 100% Brand New Material: Plastic Type: S9012, S9013, S9014, S8050, S8550, 2N3904, 2N3906, BC327, BC337, Tl431, MPSA42, MPSA92, A1015, C1815, 13001 Weight: Approx. 108g / 3.8oz Size: Approx. 174*110*22mm / 6.9*4.3*0.9in Package list: 1 * Triode Assorted Kit