Description: Compatibility20 pieces trumpets valve piston guides, engineering to fit alto horns seamlessly, these valve guides for alto horns are necessary trumpet repairing parts.Excellent MaterialCrafted from high-grade plastics, these tenor horns valve guides resist wear and tear, promising longevity and consistent performance. Enhanced PlayabilityBy maintaining optimal valve alignment, these guides help to produce a clear, stable tone. Help to improve the accuracy of the keys and improve the fluency of playing.Precision DesignEach valve guide is produced with exacting specifications to guarantee a perfect fit and effortless valve alignment, enhancing your instrument's response and air flow.Brass Instruments AccessoriesThese trumpets valve guides replacement are perfect suitable for the daily repair of wind instrument, can be installed quickly. Great trumpet repairing parts, ensuring your alto horn is always in top playing condition. Specification: Material: Plastics Size Chart: Sizes Options:18mmx15mm: front: 4.5mm, back: 5.5mm.Or19mmx15mm: front: 6.5mm, back: 4.7mm. Package Includes: 20 PiecesTrumpet Tenor Horn Valve Guides