Led Transistor flasher

This is a circuit that flashes 2 leds back and forth without any ics or micro-controllers. this is a multivibrator circuit which flashes the leds depending on the resistances of R1 and R2, more resistance means slower flashing speed, less resistance means faster flashing speed. You can also change the capacitance of C1 and C2 to also change the flashing speed.\

On the left is the circuit I made that runs on 9 volts and has output wires leading to multiple leds for a flashing sign/signal.