1 Set Contains 2 gas springsSimple installation and removalColour - BlackMaterial - SteelUsage - To be used with Advanced Lift UpsWarranty - 2 yearsNote: Hettich Gas spring needs to be ordered separately with Advanced Lift Ups (HF, HK, HS, HL). It will not be included in standard packaging of Advanced Lift Ups (HF, HK, HS, HL)