QUICK TENSION SWITCHES: The Quick Tension Switch system was purpose built to deliver extremely low friction, extended durability, and excellent key feel. The Apex 150 features an iron plate located at the base, uniquely designed membrane sheet, and the custom molded POM compound top housing inserts, make the SteelSeries Quick Tension switch unlike anything before it. Spill Resistant: The Apex 150 is constructed with an internal membrane sheet that protects and repels water from damaging the internal electronics. Two drainage cavities move liquid from your spill point to outside the keyboard. Total Control: Advanced anti-ghosting and 24-key rollover ensure no matter how fast your play you'll never miss a keystroke. Apex 150 is fully programmable to set up key combos, macros, and more.