Specifications: - Material: Silicon - Color: Black - Size: 12.5x6.2x2.2cm/4.9x2.4x0.9'' Features: ● Transistor is a 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. ● Each transistors is clear marked so you can easily identify which type of transistors you need. ● This is a great assortment of transistors for electronic professionals or enthusiasts.