Technical Wiring issue

I’m wiring my roadster and I have one question. At https://www.mafca.com/ I found simple diagram with turn signals but I wonder what are these components? They are on the front signal wires. I have correct signal switch and I want use my break lights as signals.

 

https://www.mafca.com/downloads/Seminars/2018 Reno Electrical System Alex Janke.pdf

 

I’d say they’re bullet connectors

 

Ok, so they are just connectors to separate the harnesses. Thanks!

 

Here's a little tidbit for anyone using connectors, especially bullet style.
When the connector is unplugged, you have a shielded (female) and unshielded (male) end.
The power on the harness side should be shielded to avoid shorting to ground.
In this case, the Red wire should be powered, Black ground. The left side will be the one on the component, which has no power when unplugged. The right side should be on the harness, which might have power at the shielded Red wire and the Black wire might touch ground, which it already is.