Whisper-quiet - you will notice the difference immediately. Glide almost silently on the gentle chair castors and avoid noise and expensive scratches. Perfect compatible with office,desk and gaming.Maximum protection: with the 50 mm office chair castors,you can move flexibly and protect surfaces such as parquet,laminate,tiles,carpet or stone floors thanks to the soft PVC coating.An upgrade compatible with your chairGood office chair castors are necessary compatible with a stress-free,comcompatible withtable and safe environment. They provide a quiet and peaceful atmosphere,smooth floors and safe use.Functional top quality: The two wheels on the steel axle ensure a comcompatible withtable rolling. The sturdy plastic housing sits on it and ensures a stable connection with your chair with the bridge. Easy rolling,silent gliding,360 rotation,high load capacity,protects all floorsColour: BlackMaterial: plasticSize: 11 x 22mmPackage Contents:5 x chair wheelsOnly the above package content,other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.About Shipping: All items will be shipped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances.Any questions,please feel free to contact usDuring the shopping process,if you have any questions,please feel free to consult us,we will reply you within 24 hours,wish you a happy shoppingThanks for your cooperation and we'll make you feel satisfied.