Features: Transistors are basic semiconductor device that control current, which can also be used as a non-contact switch. There are total 600 pieces of transistors in 15 values in this set which will meet you basic need. 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 Weight: Approx. 160g Type & Quantity 2N2222 40pcs 2N3904 40pcs 2N3906 40pcs 2N5401 40pcs 2N5551 40pcs A1015 40pcs C1815 40pcs C945 40pcs S8050 40pcs S8550 40pcs S9012 40pcs S9013 40pcs S9014 40pcs S9015 40pcs S9018 40pcs Package Includes: 1box x Transistors 1、Transistors are basic semiconductor device that control current, which can also be used as a non-contact switch 2、There are total 600 pieces of transistors in 15 values in this set which will meet you basic need 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