Part one : Description of this product

Ceramic wheel used for enamel insulated wire or silk thread qpproriate 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 AL203, hardness HRa 88, density 3.85.

Part two: Types and specifications: