In the BLUE box : It's our empty gas spring reference that you can find in our brochure or website.
In the RED box : It's the reference including the force. The force is composed of 4 digits placed just before the V or D. In this case (see picture) it's 800N.
For the traction spring and also the damper, the force is at the end of the reference. (----N).
* All our threaded gas springs are sold without end fittings.