1、Transistor is a basic semiconductor device that control current, which can also be used as a non-contact switch 2、There are total 200 pieces of transistors in 10 values in this set which will meet you basic needs 3、All transistors are well packed and assorted in a transparent box for convenient storage 4、Each transistors is clear marked so you can easily identify which type of transistors you need 5、This is a great assortment of transistors for electronic professionals or enthusiasts Features: 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. Specifications: Material: Silicon Type: 2N3904, 2N3906, 2SA1015, 2SC1815, 2N4401, 2N4403, 2N5551, 2N5401, MPS2222A, MPS2907A Quantity: 20pcs each type Package Includes: 1 Box x Transistors Note: Transistors are sorted manually, so there might be small mistakes on type and quantity. Thanks for your understanding.