New Springlift Ni-slide Gas Springs attwood Marine Sl34-60-5 20" Extended 12" Compressed 8 Stroke Socket 10mm Composite Force 60 lbs. Rod 8mm : Popular replacement gas springs. Made with bio-degradable no hazard to water grade oil WGK making them the marine industrys most environmentally friendly gas springs. All springs pass ASTM B117 Attwood Salt Spray and a 30 000 cycle lifecycle test. Mounting brackets available separately.