General description These 50mm office chair roller castor wheels are designed for universal compatibility and come in a stylish black and white color scheme. This set includes 10 durable plastic casters, perfect for replacing old or damaged wheels on office chairs. Technical specifications Diameter: 50mm Material: Plastic Contents: 10 x Universal casters Measurement allowed error: +/- 1-3cm Other information Note: Light and different displays may cause the color of the item in the picture to differ slightly from the actual product.