2 pieces gas compression springs 250 N force Lift Automatic with 4 clips by DELIAWINTERFEL Gas piston 250 N for KessebhmerForce: 250 N nominal value (current model 2014 real force: 265 N)Total length: 210 mm extended / 155 mm retractedLength center to center of the cap: extended 195 mm / 140 mm retractedIncl cover cap and installation Instructions The photo shows the force of the piston in Newton (N) 2 pieces gas compression springs 250 N force Lift Automatic with 4 clips