buzz For Yamaha Trumpet Water Key Screw SP ■ Unused ■ Silver-plated finish ■ Brass made Improves sound cohesion by increasing adhesion. Because of the emphasis on adhesion, installation may be difficult in some cases, but applying grease to the screw threads will allow for smooth installation. ＜About Shipping＞ ■ Nekopos (shipping costs covered by us) ■ Ships within 1-2 business days after confirmation of payment ■ Shipping-related compensation is based on the prescribed rules of the shipping method.