This sale is for a set of premium cable and satellite UHD/4K High Broadband industry approved F-81 Barrel Splice Connectors with rubber aqua-tight weather seal boot protectors on them to safeguard against moisture and water (rain) corrosion that causes signal loss.

You will get Perfect Vision (DTVF81O-05) whichever is usually whats in stock most of the time, otherwise it may be PPC CF81GHZC which is a similar make and model and I will message you 1st to make sure its ok.

They are functionally and technically identical with the same specs and capabilities.

All of the F-81 Coax Barrel Connectors will come with weather seal rubber boots on both ends regardless of what brand is shipped out to you.

The rubber covers protect the connection point where the coaxial fitting twists on to and connects to the barrel so that when it rains or snows or whatever the elements bring moisture will not get in and corrode the connection at any of your junctions spots. This corrosion actually happens very often and is responsible for over 3/4 of all cable technicians trouble calls.

More product details...
  • High Frequency / Heavy Broadband 4k Bandwidth Transmissions
  • Coax barrels join 2 coaxial cables together
  • Can be used on coax RG6 and RG59 & RG11 cables
  • All barrels come with rubber weather boot seals on each side
  • The barrels are all High Frequency brand name
  • Swept tested and rated to 3 Ghz with the blue centers
  • Operating Frequency: (5 - 3000) MHz
  • Suited for Cable, Satellite and Hi Def TV
  • Internal components designed for high frequency with minimal insertion loss
  • Center conductor assures minimum RF loss & good electrical connections
  • Resilient internal metals for dependable repeated insertion connections
  • They can be used outdoor or indoor, in a wall plate or anywhere to coaxial cables need to be joined.
  • they work on F coaxial connectors type
  • They will be made to the proper specifications to properly and effectively carry 1080p, 4k, high speed internet bandwidth and any older or newer cable technology. 
  • They can be used for and are approved for:  SD or HD TV / Directv / Dish Network / Comcast / Verizon / At&t / Cox / Charter and many more
  • The most important thing I guess to know is that they wont get burnt out like the cheaper less graded barrels.

and just a little bit more specifications and details about items...

The internal components of these are much different from a standard VHF/UHF barrel connector. The center coax conductor indexes into a close-tolerance tube that is resilient and the close center-tube tolerance assures a tight connection, the plating assures a good electrical connection and the overall performance is greatly improved over standard designs. 

Internally, the center conductor tube is insulated from the inner skin of the barrel by a maximum air gap which results in much less RF loss. 

Insertion loss is extremely low and not really necessary to consider in complex systems