Hydraulic Spring Technology: The front bonnet gas struts use hydraulic spring technology to provide better control and stability. Material:The gas spring is made of metal which has high strength good hardness and wear resistance is not easy to rust and is durable. Not easy to fade and break can serve you for a long time. Suitable For: Bonnet hood box caravan Car Bed Hatch door Cupboard Door. High sensitivity： Specially designed with high precision processing to ensure high sensitivity quick response easy to control. Car front bonnet struts are made of Stainless steel material, durable and sturdy, having stable performance., Manufacturer: welong