1、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. 2、GOOD STABILITY: Our pulleys are strictly designed and tested to make them work smoothly and stably; silent design, low friction, and durable bearings. 3、WIDE APPLICATION: This 3D printer pulley can basically adapt to most 3D printers on the market, so you can use it with confidence. 4、STAINLESS: This 3D printing wheel is different from the previous iron bearing 3D printer pulley, it is less prone to rust and has a longer service life. 5、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.