Features Control Current: 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. Convenient Storage: All transistors are well packed and assorted in a transparent box for convenient storage. For electronic professionals :This is a great assortment of transistors for electronic professionals or enthusiasts.There are 20ps BC327/BC337/BC517/BC547/BC548/BC549/BC550/BC556/BC557/BC558 Easily Identify: There is a label on box so you can easily identify which type of transistor you need.Besides,TO-92 package. Note: Transistors are sorted manually, so there might be small mistakes on type and quantity. Thanks for your understanding. 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. Package List