I have been contacted by the North American Distributor to see if there is interest in their stones in Canada. HAIDU is one of the highest quality ceramic sharpening stone on the market. They come in many different grits from 250 up to 8000 and 3 different sizes. All of them are very sturdy, even with frequent use, you can use these for years. The stones can be used dry, with oil or water - which is probably the most effective. The stones are the most effective after 2-3 uses. HCR - the biggest one in the collection, ideal for larger knives or even swords. Size: 230 mm x 70 mm x20 mm (9“ x2 3/4” x 3/4”) HCZ - Compact size. Ideal for mid or small knives. Easy to carry around even in a backpack. Size: 157 mm x 38 mm x 15 mm (6” x 1 3/8” 19/32”) HCVK - This is a great choice for smaller special tool (like channel knives) sharpening or clicking knives. This is also compatible for sharpening systems, like Apex (and its clones). Size: 160 mm x 19 mm x 10 mm (6 3/16”x 3/4” x 3/8”) HCJH - Deburring stone please note this is only one product, not a set! Size: 15 mm x 35 mm x 10 mm (6” x 1 3/8” 19/32”) The stones are made from ceramic, therefore they are fragile. Dropping them might result damage.