IDEAL FOR: Door knobs of any room where you make recording, any room where you need a sign or a door hanger in order not to get disturbed; any room that you use your microphone; any room that you produce music or podcas or you create your youtube video: your studio, your kitchen, your office. Perfectly fits with any room that you want it to be, for maintaining the streaming. EASY TO USE: “On Air” door knob hangers are elegant accessories that fits with all standard door knobs. You will love it. DOUBLE SIDED: The product has identical texts in both sides written by using UV and water-resistant inks. The product is scratch resistant and suitable to be used both indoor and outdoor. DURABLE AND FLEXIBLE: The product is made of high-quality PVC plastic material with optimal thickness. It is durable yet flexible and light. It is unbreakable and ripstop. DIMENSIONS: 9.25 x 3.5 inches This high-quality product has the best price in the market. With “On Air” door hanger/sign, you will enjoy creating your recordings, podcas, youtube video or music in a quiet and calm environment without any distraction. It will be a warning to the passerby: "I'm recording. Please do not destroy my work by entering. Leave me alone and let me work!" We hope that it will even prevent your older kids destroying your work! Perfect for youtubers! Perfect for studio work! Fits with any kind of standardized door knob at office doors, room doors, studio doors. It is cheap but it makes a big change ! DIMENSIONS: 9.25 x 3.5 inches