The DMT duo sharpening stones are our most trusted and durable stones. With the two sides: one coarse and one fine, you can get a constant edge on the running surface of your blades without the mess of oil. Plus the usable life is extraordinary. You can get anywhere between one to three seasons of sharpening depending on the usage. The larger surface area of this model is great for people that need to sharpen multiple sets of speed skates.
Note: To extend the usable life of the DMT Duo sharp stones we recommend that they be cleaned with oil and then dried completely before the next use.