GATERON Oil King Linear Switch Features Type Linear Operating Force 55±5 gf Pre-Travel 2.0±0.6 mm Total Travel 4.0 mm Max. Spring 20mm black-plated Pre-lubed Yes [Keyboard Switch] Gateron Oil King Black Keyboard Switches – Gateron Key switches are 5-pin custom switches made for mechanical keyboard DIY enthusiasts to obtain satisfying typing feelings with more affordable options.eyboard DIY enthusiasts to obtain satisfying typing feelings with more affordable options. Gateron Oil King Black Keyboard Switches 55gf Linear Switch – Gateron Oil King is heavier than Gateron Milky Yellow Pro Keyboard Switches and provides unique smooth typing experiences. Pre-Lubed Switches – Pre-lubed at the factory. Lubed switches shall effectively reduce ping for average users and maintain fast actuation. More and thick lubes can be applied afterward by individual users based on personal preference. Durability – Approximate lifespan of 60 million times of keystrokes based on laboratory durability test. Meanwhile, a single package comes with 35 switches with a plastic tray that can securely house switches and can be served as a lubing station if necessary. Compatibility – Gateron Oil King Keyboard switches come with an MX style structure so they would fit most keycap sets with (X) cross stem. Note: switch opener is not included. Built-in LED Slot – Gateron Oil King Keyboard switches are equipped with an LED slot ready for LED Mod/Assembly and aren't SMD compatible (LED underneath the switch).