Product overview The memory spring needle is made from special piano spring for reliable elasticity and long service life. Professional waterproof leather pad and elastic leather cover provide consistent sealing to maintain tone quality and response. Key benefits Durable spring action: Special piano spring construction preserves spring tension and fingertip feel through extended use. Strong airtightness: Waterproof leather pad and elastic leather cover create a tight seal that supports stable tone production and consistent pitch. Beginner friendly design: Closed hole configuration simplifies basic fingering so beginners can learn faster without struggling to cover open holes. Easy C key play: The C key is responsive and requires less effort to produce a focused, pleasant tone. Fuller, more centered sound: Good airtightness delivers a round, full tone and improves conversion rates during register changes and fingering transitions. Attributes Function: Reliable key and pad assembly that improves playability and tonal consistency. Material: Memory spring needle made from special piano spring; waterproof leather pad; elastic leather cover. Compatibility: Suited for instruments that use closed hole key designs or for players choosing closed hole fingering. Performance: Enhanced seal and spring responsiveness for steadier intonation, clearer tone, and easier basic technique development. Practical applications Beginner lessons and selfpractice: Makes early technique and basic fingering easier to learn, helping students make faster progress. Classroom and group rehearsals: Consistent response and airtightness support uniform tone across players and reduce tuning variability. Instrument maintenance and upgrades: Use as a replacement or upgrade part to restore sealing performance and key responsiveness. What to expect Stable spring feel, reliable sealing from the waterproof leather pad and elastic leather cover, simplified fingering for beginners, and a concentrated, pleasant C key tone with a round, full overall sound.