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Venev Ursa Series Dual Side Diamonds Compact 16 mm dual-sided resin bonded diamond stones for Hapstone guided sharpeners and freehand sharpening. Format 16 mm wide profile Ursa Series is a narrow dual-sided diamond stone designed for Hapstone guided sharpeners and compact freehand use. Construction Two diamond layers Each stone has two 1 mm-thick diamond-bearing layers on an aluminum plate with evenly distributed diamond grains. Performance Bonded diamond feedback Bonded diamonds provide better sharpening feedback and give the stone a much longer lifespan compared to coated diamonds. Combinations F80+ F150 F100+ F240 F240+ F400 OCB F400 OCB+ F800 OCB F800 OCB+ F1200 OCB Grit system FEPA-F classification All Venev diamonds use FEPA-F grit classification. Ursa Series is available in five grit combinations. F80 to F240 utilize the legacy binder, while F400 to F1200 utilize the OCB binder. The OCB version uses a yellow binder with no abrasive particles in the composition. OCB is available in fine grits only and offers better scratch-free sharpening results. Use and maintenance Water recommended for best feedback Venev Diamonds are recommended to be used with water as a lubricant for the best sharpening feedback. The diamond layer does not absorb water, so it is enough to splash water on the stone surface. Dry use is acceptable, although it results in faster wearing and speeds up stone loading. Additional flattening and lapping can be performed to improve sharpening quality. Loose silicon carbide powder is recommended. Diamond lapping plates are not recommended. Specifications Stone size6” × 1/2” × 3/8” (150 × 16 × 10 mm) Weight3.2 oz (90 g) MaterialAluminum AbrasiveDiamond BinderResin OCB Concentration100% FlatnessUp to 0.2 mm Working withWater, oil Stone typeDouble-sided stone