| 摘要 |
The present invention provides an abrasive material comprising a base surface having a plurality of pyramidal shapes protruding therefrom the base surface and the protrusions being formed of the same material, each protrusion having a substantially triangular, square, or polygonal base and triangular sides which meet at an apex which substantially forms a point. The pyramidal shapes have apexes in at least two distinct planes with a portion of the pyramidal shapes extending further from the base surface than others, with the apexes of the protrusions providing intermixing cutting and planning edges in a pattern such that the material is capable of abrading independent of direction of use. |
