You are purchasing 2 gas struts, most commonly used for the rear window of your Flexiglass.
The gas struts measure 435mm between centers when the canopy is in the open position and the gas struts are fully extended. They have a rating of 130N or 28lbs.
They are ideal replacements for Suspa part C16-02622 or Stabilus 228583.
These struts are easy to fit, come with a 12-month warranty.