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. 1Transistors are basic semiconductor device that control current, which can also be used as a non?contact switch 2There are total 200 pieces of transistors in 10 values in this set which will meet you basic needs 3All transistors are well packed and assorted in a transparent box for convenient storage 4There is a label on box so you can easily identify which type of transistor you need 5This is a great assortment of transistors for electronic professionals or enthusiasts