Based on F1 technology, EXT&';s proprietary AS3 dual-positive air chamber feels like a coil sprung shock 2 separate air valves adjust the positive chamber: +/++ (low/high), fine tunes air spring curve characteristics Large volume self-activating negative air chamber Unique air seals design based on aerospace technology LOK 2.0, a tunable 2-way lock-out system for pedaling efficiency on every type of surface, blow-off valve in case you forget the hit lever before descending Large 28mm hydraulic main piston with Super Finish surface treatment Adjustable Hydraulic Bottom-Out Circuit (HBC) TECH SPECS Model Aria V2 Enduro Stroke 55mm Eye-Eye 210mm