100% stainless steel (304 model), will not rust. Dimensions: 69 x 39 mm. Quantity: 12 units, suitable for bars up to 28.5 mm in diameter. Stainless, chrome finish and polished for a perfect look. Sliding system: No deformation, no effort, no stress. 5 silver balls guarantee frictionless movement. Warranty: We offer one year warranty for curtain hooks. If there are product problems, please contact us.