1. Material: Stainless Steel Making smaller size than gland hole by turning seal to omegas shape can avoid most of damages.2. Includes 3 sizes to cover any rod seal installation jobs from 0.87inch up.3. Small for rod diameters 22-40mm(0.87inch - 1.57inch ROD) gland hole, 6mm section max.4. Medium for rod diameters 40-70MM (1.57inch - 2.75inch ROD) gland hole, 8mm section max.5. for rod diameters 70-165MM (2.75inch - 6.49inch ROD) gland hole, 10mm section max.Colour:Photo ColorMaterial:Stainless steelPackage Contents:3x Hydraulic Cylinder Rod SealOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.