Description: Fine Material: The triode transistor is designed and made with durable plastic, which can be used for longer time. Multiple Pieces: Within the package there are altogether 900 pieces transistors that can be used for a period of time. Heat-releasing: The triode transistor features good heat-releasing ability, which is less likely to change its shape due to the high temperature. 18 Kinds: Within the package there are 18 kinds of transistors that you can choose to use according to your need. Portable: The transistor is of small size and weight, so it is convenient and easy for us to carry and operate. Specification: Material: Plastic. Color: Shown as Picture. Size: Approx. 20x11.5x2.3cm/7.87x4.53x0.91inch. Note: There might be a few color distortions due to different computer resolutions. There might be a slight error due to different hand measurements. Package Includes: 900 Pieces Triode Transistors.