FAQ:1.What axis does the keyboard use?Outemu mechanical switch, 50 million times life pure copper foot shaft. 2.What is the difference between the green axis and the red axis? Green axis is the representative axis of mechanical keyboard. It crackles and crackles with crisp sound. It has a sense of bringing in, but it's noisy. Buyers who are afraid of noise must not choose green axis. Red axis is quiet, not as noisy as green axis, but the red axis triggers faster. It's the favorite of game and office people.