Crystal Silver 43gf Linear Switch – With the 24.5mm extension spring, the PC/PC/PC materials will make the switches more transparent. With short pre-travel of 1mm, this is one of the fastest Akko CS switches and is ideal for gaming. Built-in LED Slot – Akko CS switches are equipped with LED slot ready for LED Mod/Assembly, and are SMD compatible (LED underneath the switch). Durability – Approximate lifespan of 60 million times of keystrokes based on laboratory durability test. Meanwhile, a single package comes with 45 switches with plastic tray that can securely house switches and can be served as a lubing station if necessary. Compatibility – Akko CS switches come with MX style structure so they would fit most keycap sets with (X) cross stem. Note: switch opener is not included.