Crossed Tungsten bars-blades for quick edge setting Crossed ceramic bars for a razor sharp finish and polish Scientificly designed and set sharpening angles delivers best results Non-slip rubber base, on both sides. Hole for Lanyard or chain Hand grip with texure for comfort and control Product description Tungsten (carbide grade) and ceramic rods. Designed and manufactured with non-slip rubber base and textured hand grips on each side for safe and greater comfort and control. Having 2 tungsten carbide cutting rods with a scientifically determined and pre-set angles ensure and guarantees the perfect edge sharpening. 3-4 strokes, backwards, restores the sharpness of the blade's edge. Benefits: Crossed tungsten blades provide quick edge sharpening and crossed ceramic rods deliver razor sharp edge sharpening angles. Hand held model instructions: 3 or 4 strokes through tungsten carbide slots will restore the edge of a dull blade. 2 or 3 strokes through ceramic rods will complete the process and will polish and finished edge of already sharp blade. Excellent for use on all types of knives. Complete and accurate sharpening.