Features: This 250piece PNPs/NPN transistors assortment includes A1015, BC327, BC337, and C1815 models for circuit design, delivering stable performances in amplification and switching applications with optimized gains and noise reduction. Featuring standardized TO 92 packaging with clear markings, these silicon metal transistors ensures easy PCB integration, high temperature durability, and soldering for seamless prototyping and repairs. for electronics students, engineers, and enthusiasts, this supports educational projects, sound amplifiers builds, and precisions circuit repairs requiring component levels troubleshooting. for low to power scenarios like sound signals processing, radio transmitter modules, and automated switching systems, ensuring crisps output and energy efficient operations. Engineered with premium semiconductor materials, these transistors outperform standard option in response speed and thermals stability, maintaining consistent performances under demanding electrical loads. Specifications: Materials: Silicon + Metal Color: Black Size:as picture show Specifications: PNPs NPN Package Includes: 250Pcs General Purpose Transistors note: Please allow 0-1cm error due to manual measurement. make sure you not mind before bid. Due to the differences between different monitors, the Pictures may not reflect the actual of the item.