Features STAINLESS STEEL This 3D printing wheel is different from the previous iron bearing 3D printer pulley, is less prone to oxidation, and has a longer service life. GOOD HELPER: This 3D printing wheel of ours has high printing accuracy, which can improve the printing speed very well and make your work more perfect. WIDE APPLICATION: This 3D printer pulley can basically be adapted to most 3D printers on the market, so you can use it with confidence. 48PCS: The set includes 16PCS POM wheels, 16PCS spacer columns and 16PCS hexagonal eccentric spacers, which is a very complete set of 3D printing accessories. GOOD STABILITY: Our pulleys are strictly designed and tested to work smoothly and stably; Quiet design, low friction and durable bearings. Specification: Item Type: 3D Printer Pulley Wheel Set Material: Precise steel and POM Pulley inner diameter: approx. 5mm/0.2 inch Pulley height: approx. 10mm/0.39 inch Duct: approx. 6mm/0.24 inch Pulley outer diameter: approx. 24mm/0.94" Eccentric spacer and cylinder inner diameter: approx. 5mm/0.2 inch Eccentric spacer and cylinder height: approx. 8mm/0.31 inch Product Use: For 3D printers Package List: 16 Pulley Wheels for 3D Printer 16 x Eccentric Spacer 16 x Round Column Small note: Please note that there is a moving copper ring between the bearings. Ring movement is normal, otherwise the bearing cannot rotate. Not a quality problem. Package List 16 x 3D Printer Pulley Wheel 16 x Eccentric Spacer 16 x Round Column