A nice touch is the smooth spring action inside this unbranded relay, which feels reliable without being too stiff.
2Pin LED Flasher Relay with Ground Wire for Car Truck SUV 12V Fix Flickering
This unbranded relay comes with a clear plastic cover, so dust stays out and you see the internals easily.
What stands out about this model is that it's a contactor relay, making it great for more demanding setups.