The fans for this price are simply a one-way street for those who want a budget build with good airflow. They are quite sturdy. They also have a molex connector, so for those who have budget motherboards, it will be very convenient. In the molex connection, they work at 100% and you can't adjust the rpms, but they are incredibly quiet. I really didn't expect this at such a price.

Unbelievable fan for its price. It has a Hydro bearing, and even though it pushes a lot of air, they are almost silent at full speed, and completely quiet at 700-800rpm, whether on a cooler or in a case (whether in push or pull, they "don't notice" any static pressure). What else can I say?
Sometimes products from small manufacturers achieve "crazy" performance. I have two in push-pull for liquid cooling on one of my PCs for over 2 years and they haven't skipped a beat. I bought another two for a Hyper T4 on my other PC recently.