A complete range of gas springs for boot, hatchback door and also for bonnet, as well as the possibility to supply tailor made products upon specific request of the customer by knowing the technical features desired . The Gas Springs is designed to assist the opening and closing of the door balancing its weight : as the door is closed the gas under pressure is compressed until the door is finally shut . During the release a special valve in the piston allows the spring to open at a controlled velocity.