The Easton Z flex stabilisers have an "AVRS chamber for rapid vibration amplitude dissipation after the shot", but it's not explained what this actually means on their website and I couldn't find a relevant patent. Searching online, it seems like it stands for Active Vibration Reduction System, in which "active" indicates that there's a circuit with a vibration sensor and an actuator that actively cancels out vibration. It's not a common acronym.
Given electronics aren't allowed in/on bows, this is clearly not the same as what's inside the Z flex. Based on its mass and that the lightest stabilisers (likely just an empty tube given the cost) weigh about 60g less for a similar length and diameter, is it just fancy terminology for "we put some foam inside"? The internal volume is likely about 180 cm^3 so that would give a fully filled foam density of 0.3 g/cm^3, which is a common value for polymer foams.
Given electronics aren't allowed in/on bows, this is clearly not the same as what's inside the Z flex. Based on its mass and that the lightest stabilisers (likely just an empty tube given the cost) weigh about 60g less for a similar length and diameter, is it just fancy terminology for "we put some foam inside"? The internal volume is likely about 180 cm^3 so that would give a fully filled foam density of 0.3 g/cm^3, which is a common value for polymer foams.