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Features: It's brand new, good quality & high perf ormance Sharpening Stones For Sharpener Professional Sharpening System A fine-grained whetstone lubricated with oil, used for fine sharpening. The Ruby sharpening stone and Agate Stone,For Polishing,Sharpening. Can Make Mirror surface, mirror finish. The Ruby Sharpening stone is made from sintered crystals of synthetic ruby. It's extremely hard, maintain their shape well and are resistant to wear. Mainly used in industrial instrumentation, precision parts, miniature knives, stones, measuring tools, cutting tools, instruments, carbide, etc.