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.