Sanwa OBSCS-30-C Silent Snap In Arcade Button - Arcade World UK
Sanwa OBSF-S 'silent' buttons: a look - YouTube
SANWA Silent Buttons | Rhythmo
Amazon.com: Sanwa 8 pcs OBSF-30 Original Push Button 30mm - for Arcade Jamma Video Game & Arcade Joystick Games Console (Gray), Use for Arcade Game Machine Cabinet S@NWA : Video Games