UDP Guard are unique propeller protectors for 5 inch copters. The protectors are made by injection molding technology from the material used for the production of propellers. This makes the protectors very durable. The protectors can be used on almost any frame that can hold 5" propellers. For flights with protectors, you will use 4 "propellers (Gemfan 4052 are recommended). You can easily turn your regular freestyle copter into a Cinewhoop, suitable for shooting indoors, near other people or wherever the bigger propellers pose a risk.