Transistor is a basic semiconductor device that control current, which can also be used as a non-contact switch. There are total 200 pieces of transistors in 10 values in this set which will meet you basic needs. All transistors are well packed and assorted in a transparent box for convenient storage. Each transistors is clear marked so you can easily identify which type of transistors you need. This is a great assortment of transistors for electronic professionals or enthusiasts. Type:BC337, BC327, 2N2222, 2N2907, 2N3904, 2N3906, S8050, S8550, A1015, C1815 Colour:Black Material:ABS Size:10 x 6 x 3cm Package Contents: 1 set x in-line triode Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.