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FEMA shock absorbers for models up to 10kg.FEMA retractable landing gears can be equipped with shock absorbers for softer landings. The damping force required for a model is calculated according to the following formula: Damping force (N) = Model weight (kg) x 40A model weighing more than 10kg should use 2 dampers. For a model weighing more than 20Kg, three dampers will be required.