Description The spring accessory for trombone is designed to enhance the performance and durability of your instrument. Made from quality materials, the spring ensures long-lasting use and reliability. With the precise design, the keys are highly responsive, allowing for smooth and effortless playing, and enhancing the musical expression. Easy to install, this spring is compatible with various brands of trombone, providing convenience and efficiency. Features -Color:Silver -Material:Special steel -Size:3.50X3.00X2.50cm/1.38X1.18X0.98in -Inner diameter:5.5mm -Made from quality materials, the spring ensures long-lasting use and reliability. -With the precise design, the spring is highly responsive, allowing for smooth and effortless playing, and enhancing the musical expression. -The unique feature adds richness and fullness to the instrument's sound, making your playing experience more enjoyable. -Easy to install, this spring is compatible with various brands oftrombone, providing convenience and efficiency. -Tested rigorously and subjected to strict quality, this spring guarantees stability and reliability, giving you peace of mind.Package list: 1 x spring