A party horn—also known as a blowout, party blower, noisemaker, or party whistle—is a small handheld device designed to generate festive noise at celebrations. It typically features a plastic mouthpiece attached to a coiled paper tube (often with a thin internal reed or metal/plastic strip). When blown into, the tube unfurls with a crisp, buzzing honk, and then snaps back into place once the airflow stops. These horns come in vibrant colors, patterns like polka dots or confetti, and are made from durable plastic and paper—often reusable and resistant to tearing. They range from compact 2.75-in tubes to extendable lengths of around 9 in (22 cm) when fully out. They’re staples at birthdays, New Year’s Eve, weddings, sporting events, and even cultural celebrations—used to kick off fun, rally crowds, or signal joyous moments. Because they’re lightweight, disposable, and often come in bulk packs (50, 60, 100 pieces), they’re ideal for enlivening large gatherings. The loud honk comes from blowing air through a narrow tube, which vibrates a reed. The paper tube unfurls and retracts automatically. Mouthpieces are plastic to resist moisture damage; some models include shiny fringes or tassels for added flair.