Manufactured with silicon tube and germanium tube material, reliable andcan be applied for a long time. Thesetransistor kits are basic components of semiconductor, which can amplify current, with low power consumption, can be used for a long time. Features -Color:Black-Material:Silicon tube, germanium tube-Size:12.80X6.50X2.20cm/5.03X2.55X0.86in-Specification:S8050, S8550, S9012, S9013,S9014, 2N3904,2N3906, C1815, A1015,MJE13001-With high dielectric strength, fast switching, large power dissipation and good current performance.-The transistors are compact in size and light in weight, which is nice for carrying and storing-The transistors are great for electrical experiments, DIY projects, electrical products repairing, etc.-These are different types of our transistors for different use, very practical and professional.-The transistors are packed in the rugged, convenient, sealing plastic storage case, easy to store.Packing list: 20 x Transistors S805020 x Transistors S855020 x Transistors S901220 x Transistors S901320 x Transistors S901420 x Transistors 2N390420 x Transistors 2N390620 x Transistors C181520 x Transistors A1015 20 x Transistors MJE13001