Button rollers with buffer springs f installation. Suitable f flat sliding shower dos curved sliding shower dos.The top roller has no buffer spring, you can adjust the position of the wheel by adjusting the screw.Made of heavy-duty zinc alloy brackets, stainless steel wear-resistant nylon wheels. high quality. Designed with wear-resistant pads, me durable to use.colour: silverMaterial: nylon and zinc alloy and stainless steelsize: 23mmPackage Contents:2 x Top Rollers2 x Bottom Rollers2 x Bumper Block1 set x ScrewsOnly the above package content, other products are not included.Note: Light different displays may cause the col of the item in the picture a little different from the real thing. The measurement allowed err is 1-3cm.Our products are made with the highest quality materials are designed to provide you with the best possible user experience. We strive to ship out all ders within three days of purchase, the estimated delivery time is 8-15 days.When shopping, please pay attention to the size dimensions of the product to ensure that it meets your needs. In the title , we have provided detailed infmation about the product, including its features specificationsWe want you to be completely satisfied with your purchase, so if you have any questions concerns, please don''''''''t hesitate to contact us. We are here to help will do our best to assist you.Thank you f choosing our product. We hope you enjoy it