Features: The central distance of the spring is 290mm,suitable for a large range of application. Made of fine material of long service life,more durable in use. We provide different spring of different pressure to meet your different needs. The stroke is 100mm which is enough for most scenarios. Suitable for flip cover for equipment, snack car, tricycle up door, advertising bar, light box, flip window, hood. Specification: Item Type:Gas Spring Central Distance: 290mm / 11.42in Stroke: 100mm / 3.94in Pressure: 100N 300N 500N(Optional) Package List: 1 x Spring Note: 2 caps with a pressure of 100N can support a lid of about 6-10 kg 2 caps with a pressure of 300N can support a lid of about 24-30 kg 2 pieces of pressure 500N can support a lid of about 40-47 kg.1The central distance of the spring is 290mm,suitable for a large range of application. 2Made of fine material of long service life,more durable in use. 3We provide different spring of different pressure to meet your different needs. 4The stroke is 100mm which is enough for most scenarios. 5Suitable for flip cover for equipment, snack car, tricycle up door, advertising bar, light box, flip window, hood.