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 NewMaterial: PlasticType: S9012, S9013, S9014, S8050, S8550, 2N3904, 2N3906, BC327, BC337, Tl431, MPSA42, MPSA92, A1015, C1815, 13001Weight: Approx. 108g / 3.8ozSize: Approx. 174*110*22mm / 6.9*4.3*0.9inPackage list:1 * Triode Assorted Kit