Features: 1.Smooth without damage to the ground: P_material is polyurethane material, wear-resistant, black inner wheel. 2.High quality electrophoretic material: with strong film hardness, strong impact resistance, high film adhesion, not easy to fall off and aging. 3.Double bearing structure: Excellent load-bearing capacity, single load-bearing 20-25KG. 4.Imported bearing steel balls: high and uniform hardness, good wear resistance, not easy to fall off. 5.Quiet design: farewell to roar and enjoy quiet life. 6.60 Aesthetics: Smooth and Simple Wheel Body Line, 60 Angle of Smart Appearance. Descriptions: 1.Perfect to protect and preserve your floor. 2.The polyurethane material used on our office chair wheels protects your floor of all the scratching and damaging of your hardwood, vinyl and stone floors, you can finally get rid of that desk floor mat. Specifications: Material: PU+Nylon Size:2inch Color:white,gray Maximum load: 20-25KG Package includes: 1x Universal Casters Notes: 1.Due to the difference between different monitors, the picture may not reflect the actual color of the item. We guarantee the style is the same as shown in the pictures. 2.Please allow slight dimension difference due to different manual measurement.