FAA/PMA approved shock units.
For Piper Models: PA18, PA20, PA22, and PA22-150
WARNING: The product may contain and/or expose you to a chemical(s) or substance(s) which are known to the State of California to cause cancer and/or birth defects or other reproductive harm. www.P65Warnings.ca.gov
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2.15 lbs, about 9" long. The vendor was not sure what they meant by interface and capacity.
These do not have springs.