1.Introduction of I-belt Pulley I-belt Pulley is a 3D printer accessory, made of high-strength POM material, processed by a CNC lathe, assembled with two 6952 bearings, with an inner hole of 5.0mm, high progress, smooth sliding without jams. We have been committed to hardware processing for many years and look forward to becoming your long-term partner in China. 2.Parameters (specifications) of I-belt Pulley I-belt Pulley is made of high-strength POM material Size: 17mm*10mm Weight: 3.0g