Marking flags are simple signs used to draw attention. A specific message can be conveyed by adding text or an illustration to the flag. They can be used at construction sites or during construction to prevent accidents among workers or passers-by. Red, white or other striking colors can be selected for the flag background material or text to create a flag type that makes the viewer readily aware of the danger. Can be used together with yellow and black striped caution rope to further increase caution. The streamer type is usually used on roads, and makes it easy to see the wind direction or speed. It is used to ensure the safety of cranes or vehicles with high loads that are affected by wind resistance. Models of this type are made of materials such as polyester, polyethylene or EVA resin. Sign flags come in various shapes and sizes, so should be chosen to fit the application.