BULB FOR DOUBLE BELL HORN, extends length of other horns, w/free mounting tips booklet, protectant BRAND NEW: Budget price. Bench tested. Satisfaction Guaranteed. JUST SCREW-ON AND HONK: Fits Double Bell bulb horns. Also extends length of Circular, Large, Small and Straight bulb horns. (Does NOT fit Mini horns.) FREE EIGHT-PAGE FULL-COLOR ILLUSTRATED BULB MOUNTING TIPS BOOKLET packed with each shipment. PRE-APPLIED RUBBER PROTECTANT guards against ozone, oxidation and UV radiation - extends life of rubber. CERTIFIED INSPECTION: Authentic Folkroots bulb horn products include official inspection certificate verifying item was bench tested, passed, and guaranteed by Bone Dry Musical Instrument Co.