High voltage experimenter flyback assortment contains 3 different heavy duty flybacks for creating large ARC. Check the internet for various easy to build circuits for driving flybacks. You get 3 different flybacks in each assortment - some will have control knobs - some not. All will have pins on bottom and a very high voltage wire on top terminating in a high voltage kilovolt cup connector for CRT's. Brand new - but no specs or hookup info. Assortments will vary from picture shown.
Disclaimer:You should not buy these flybacks unless you are familiar working with high voltages and you should be careful to take all safety precautions when using these flybacks.