161 pcs 20 models, Each with individual compartments. Pin assignment table included. IC Plier included for easy picking and removing IC LM358 Single Supply Low Power Dual Operational Amplifiers` LM324 Single Supply Low Power Quad Operational Amplifiers JRC4555 Dual Operational Amplifiers NE5532Dual Low Noise Operational Amplifier LM386Low Voltage Audio Power Amplifier TDA2030 14W Hi-Fi Audio Amplifier. TDA2822 DUAL LOW-VOLTAGE AUDIO POWER AMPLIFIER UA741 The Classic Operational Amplifier LM393 Low Offset Voltage Dual Comparators LM339 Single Supply Quad Comparators PC817 General Purpose Photocoupler CD4047CMOS Low-Power Monostable/Astable Multivibrator CD40533-channel Analog Multiplexer With Logic-Level Conversion NE555 Precision Timer, Pulse generation, Oscillator PT2399Digital Delay Echo Audio Processor UC3842Current Mode PWM controller UC3843Current Mode PWM controller ULN2003 50-V, 500mA 7-ch Darlington Transistor Array, ULN2803 50-V, 500mA 8-ch Darlington Transistor Array, 7660 Switched-Capacitor Voltage Converters