Manufactured with silicon tube and germanium tube material, reliable and can be applied for a long time. These 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 are compact in size and light in weight, which is nice for carrying and storing -The are great for electrical experiments, DIY projects, electrical products repairing, etc. -These are different types of our for different use, very practical and professional. -The are packed in the rugged, convenient, sealing plastic storage case, easy to store. Package list: 20 x S8050 20 x S8550 20 x S9012 20 x S9013 20 x S9014 20 x 2N3904 20 x 2N3906 20 x C1815 20 x A1015 20 x MJE13001