This is for 6 Drylin® RJ4JP-01-08. I can make individual listings for other quantities if needed just contact me.

Make your 3D printer quieter by removing the rather cheap quality LM8UU linear bearings and directly replacing them with these Igus® Drylin® RJ4JP-01-08 bearings 

Linear bearings are meant to be loaded radially such that the ball bearings inside them roll. In 3D printing applications the weights and loads are too low which allows the balls to slide. This sliding is in turn is the cause of noise and wear on the bearings. Drylin® bearings also have the added benefit of not requiring lubrication which makes them far less messy.

The Drylin® RJ4JP-01-08  bearings are direct replacements for LM8UU linear bearings that slide on 8mm round rails as found on Wanhao i3, Prusa i3, Mendel Max, Rostock and any other printer using linear bearings SC8UU or LM8UU

Before installation ensure that the contact surfaces are free from any type of lubricant ( oil, grease, or dry lubricants)