They call the last one “the ladies.”Noor Mohammed, who owns a shop here, says their bestsellers can be classified in two types: “titi” horns and “pom pom” horns. (Omkar Khandekar | NPR)In recent years, he says, there’s been a spike in demand for the “pom pom” horn. “Pedestrians don’t listen if you use the “ti ti.” They make way when you use the high-pressure pom pom horns,” Mohammed says. A new “pom pom” horn costs less than $10 and can last a year or longer, depending on how much you beep. Some motorbike-makers have made their horns louder in recent years, and some car-makers have made their horns punchier, with more bass.