We offers high quality fully ceramic idler pulley and Solid ceramic wire guide pulley with bearing (ceramic roller) for  Textile, Fiber and Wire Processing Machines.there is description about it as following:

Coil winding Ceramic wire guide idler pulleys (Solid ceramic idler pulley)ceramic roller is used on coil winding machine and textile machine for enamel insulated wire or silk thread appropriate amount guiding, the china circle makes from precise ceramics, the surface smoothness that the china marks with a circle reaches Ra 0.2, moves up and down when rotating being smaller than 0.15 , material selects and uses 99%'s AL2O3 , hardness HRa 88, density 3.85.The fully ceramic idler pulley and solid ceramic pulley with bearing are our feature products with competitive price in china.