Made by AMASS, they make reliable connectors, that's the name you can trust. You are looking at the XT90-S connector, that "S" means Anti-Spark, compare with ordinary XT90 connector, this one has more protection when you connect with high voltage battery packs like the 22.2V or even 44.4V.
What is the XT90 Connector?
XT90 connector is bigger than XT60 connector, usually for large size RC model, like big helis up to 600-800 class or drones up to 800-1000 class, it can with stand very large current from the battery pack. In our opinion, we like this big connector, great for guys with large fingers.