Here's some quick facts about this item
This particular type of cable is two satellite grade coaxial cables joined together to allow one to receive and one to record at the same time.
It is commonly referred to as shotgun cable and used in the majority of today's Sky and Freesat satellite installations.
Cable Spec
0.65CCS, 2.9 FPE, AL FOIL +112*0.12AM, PVC 4.5 BLACK