1、Transistors are 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、There is a label on box so you can easily identify which type of transistor you need 5、This is a great assortment of transistors for electronic professionals or enthusiasts Features: Transistors are 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. There is a label on box so you can easily identify which type of transistor you need. This is a great assortment of transistors for electronic professionals or enthusiasts. Specifications: Material:  Silicon Package: TO-92 Application: Amplification Type and Qty: BC327 20pcs BC337 20pcs BC517 20pcs BC547 20pcs BC548 20pcs BC549 20pcs BC550 20pcs BC556 20pcs BC557 20pcs BC558 20pcs 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.