SPARE RUBBER BULB w/free mounting tips booklet & protectant - fits most bulb horns BRAND NEW: Budget price. Bench tested. Satisfaction Guaranteed. JUST SCREW-ON AND HONK: Fits Circular, Large, Small and Straight horns (not Double-bell or Mini). FREE EIGHT-PAGE FULL-COLOR ILLUSTRATED BULB MOUNTING TIPS BOOKLET packed with each shipment. 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. HAND APPLIED PROTECTANT: Extends life of rubber. Guards against ozone, oxidation and UV radiation.