Gas Spring for bonnet suitable for BMW. The bonnets of many vehicle models are not held open by a support rod which must be latched in by hand, but rather by a gas spring. The pressure inside the spring makes it easy to open and close the bonnet. To prevent the bonnet from closing on its own, the gas spring must be precisely adjusted to its weight and position. febi offers a comprehensive range of gas springs in the best possible quality. Ferdinand Bilstein relies on constant premium quality for gas pressure springs with a long-standing aftermarket partnership with original equipment supplier, Stabilus.