These action camera mounts look solid throughout. Particularly noteworthy is the strong adhesive strength of the included 3M pads — provided that you thoroughly clean and degrease the surface beforehand. A few cleaning cloths included would have been handy, but that's not a big minus point. The holders themselves are compact and not too bulky, which is particularly important for helmets with limited space or ventilation slits. They are slightly flexible and are suitable for slightly curved surfaces — but with very irregular or heavily perforated helmets, it is difficult to grip. The material looks robust and neatly finished, and assembly is easy. It is important to take time to apply them: The pads only stick correctly once — readjustment is barely possible afterwards. But if you work carefully, you get a really solid connection. Conclusion: Good and sturdy mounts at a fair price. Ideal for helmets or similar surfaces as long as there is enough contact surface. For anyone looking for a reliable camera mounting solution, this is a clear recommendation — as long as you take some care when installing it.