What you are buying here are fittings also called connectors that attach to the ends of coaxial cables.
Coax cables are what cable, satellite and internet provides use to connect their services to your TV, modem, cable boxes etc...
The vast majority of cable, satellite and internet issues and outages are the result of broken, burntout or corroded connections as a result of cheap or badly made connectors.
These are premium top of the line fittings for RG6 cables that they make.
These connectors (fittings) attached via a compression method which means it will take massive force for it to become unattached from its cable
They are made of top of the line materials and metals so water or moisture will not get inside and the connector will never rust or corrode.
These are worth it in the long run.