Accessories to subtly adorn your saxophone ✨ Our workshop's original "Key Guard Stone" set of 4 green onyx stones. These stones are designed to be placed on the felt of your key guards. Sizes available are 6mm for Yamaha, Yanagisawa, and Selmer SA80 (Series I) saxophones. For Selmer Series II and Series III, please select the 6.5mm size, which is listed separately. Inspired by models like older Crampon saxophones, which feature mother-of-pearl on the key guard, as shown in the last photo. The stones are green onyx, which complements the green felt often found on Selmer and Crampon saxophones. The base has reflective aluminum foil and instrument-grade cork attached, designed to fit into the bumper felt hardware. To install, carefully insert the Key Guard Stone while holding the bumper felt from behind. To remove, such as when taking your instrument for adjustments, you can use tweezers or a toothpick to insert into the groove of the bumper felt hardware and remove the stone. As these are handmade, the finish isn't perfect, but they subtly sparkle and look quite nice! Perfect for a touch of understated customization for adults. We plan to release other colored stones gradually. Please inquire if you are interested. #KeyGuardStone #Selmer #Yamaha #Yanagisawa #KeyGuard #KeyPearl #Custom