Ninja 90/4500 CF Pro Carbon Fiber HPA Tank BLACK Carbon Fiber Tank Ninja Pro Regulator Made in USA Twist Technology (360 Degree Adjustability) - Twist technology allows you to simply and quickly align the fill nipple and gauge to the position of your choice, without disassembling your regulator 2nd Generation SRT (Sonic Recharge Technology) Piston provides rapid recharge rates that virtually eliminate regulator shootdown