You are purchasing 2 gas struts, most commonly used for the windows of your Flexiglass, Tourertop or TJM Canopy.
The gas struts measure 355mm between center of the cups when the canopy is in the open position and the gas struts are fully extended. They have a rating of 110N or 24lbs.
They are ideal replacements for Suspa part C16-06389 and C16-28554
These struts are easy to fit, come with a 12-month warranty.