Three words describe these amazing buttons: smooth, sensitive and quiet. These snap in based buttons are for metal control panels with 30mm holes. Include most common fight sticks such as MadCatz, Hori and Qanba. 
Initially released in small batches at EVO 2016, these much anticipated metallic buttons are now here!  Sanwa worked for years to get the perfect paint coating to prevent peeling and scratching that haunt other manufacturers.
Currently only come in 30mm size, 24mm is in the works.  
 
Specifications:
.110" quick connects
30mm diameter buttons
Snap-in buttons