I ordered a cat5, when it arrived, I realized that it’s not mention anywhere the speed.
Do I really need a cat5e or for 50m a cat5 is enough ?
A Cat5 cable is certified for 100mb for up to 100M. A Cat5e cable is typically recommended for gigabit speeds up to 100M. I would say with 95% certainty that your cable (which appears to be a high quality cable with Neutrik connectors) will work just fine. I would be more concerned with how rugged the cable jacket is to withstand any abuse - such as people walking on it, or heavy cases rolling over top of it. Good luck!