Feature:1. Made of high quality stainless steel, strong and durable, has a long service life.2. The inner diameter of the wheel is 5mm and can be adjusted with a 10mm wrench.3. Used for MK8 model printer, good extrusion auxiliary effect, it is a very practical accessory.4. With 10pcs wheels, can meet your use and replacement needs, very practically.5. Small size, easy to carry and store, convenient to use and with good performance.Specification:Item Type: 3D Printer Extrusion Wheel Material: Stainless SteelProduct Size: Approx. 9 x 11mm / 0.4 x 0.4in (error 0.05)Product Use: FeedingColor Classification: Sier whiteDiameter: Approx. 5mm / 0.2in Package List:10 x 3D Printer Extrusion Wheel