While reorganizing our warehouse, we discovered a few boxes of these brand new pushbuttons.  These have not been sold in our store (original) since 2018.  

The KURO pushbutton marked Hori’s first venture into the arcade-parts market. Designed with durability as a top priority, these buttons were built to withstand heavy use, making them ideal for players with strong, aggressive inputs—especially those who favor hard button slaps during gameplay.

These have been out of production since 2018.  All of the units we have remaining our brand new push buttons was the custom print on them. We do not have any push buttons without the print for those who may be Wondering

From Hori's Website: 

HORI Kuro buttons have been designed with less spacing between the housing and button for quicker response

Before there was the short throw Hori Hayabusa pushbutton, Hori entered the parts market with their durable, responsive Kuro pushbutton.   These were made primarily during the fight stick market (controllers that have joysticks, not all button), so only 30mm were available

These are all brand new, unused pushbuttons.  

For those who have used these before, they are known to take a beating and are meant for the heavy handed players.  Very precise and durable.