Total Silver Post Mounting Screw for GP Selmer, 950 Silver ★Compatible Models: Selmer (Alto & Tenor, Universal) ・Can be used on Mark VII and current models. By replacing the bell post screw with a total silver one, you can achieve a more expansive resonance, improved high-range extension, and responsive articulation in the low range, along with a weighty sound, that you can't get with brass. Experience a surprising change! Shipping takes 4-7 days. Thank you for your understanding. #NagasawaSeisakusho #BellPostScrew #Saxophone #Selmer #Yamaha #Yanagisawa