Set of 5 cork spit valve seals for trombones. Made from durable cork material that resists deformation, these cork plugs provide a reliable, close fit for easy integration with standard trombone water keys and spit valves. Key benefits Consistent seal and playability: Precisionshaped cork helps prevent air leaks around the water key, supporting stable tone and response. Durable and deformationresistant: Natural cork construction maintains shape under repeated use, reducing the need for frequent replacements. Ready replacement pack: Five seals per set let you worn parts quickly or keep spares on hand for rehearsals and gigs. Easy to install: Simple pushin fit lets players and technicians swap seals without special tools. Suitable for all skill levels: Useful for students, marching band members, teachers, and professional musicians who want reliable valve performance. Function and compatibility Function: Designed to seal the trombone water key or spit valve, control moisture release, and maintain consistent air flow. Compatibility: Intended for most standard trombone water keys and spit valves. Check dimensions on your instrument if a custom fit is required. Material: Natural cork that resists compression and helps retain an effective seal over time. Use scenarios Practice and rehearsal: a worn seal to restore consistent tone and reduce intermittent air leaks during daily practice. Performances and marching events: Keep spare cork seals in your case for quick onsite replacements between sets or movement changes. Instrument maintenance: Include the set as part of a basic kit for teachers, students, and technicians to address common water key wear. Simple, reliable, and practical, this set of 5 cork spit valve seals helps maintain water key performance and supports consistent playability for trombonists at every level.