The ID tag is PTFE tube and then buy it, personal preference on which one you get as they all work. some will fit the little brass things and some won’t, i use capricorn as it resists the bending if it snags up.
These are called pings and are required for the machine to know how much filament it has used. you are not at risk of fire because filament does not catch fire until 388 degrees celcius . If you looked up the MSDS you would know this. Flammability: Autoignition temperature: 388°C