The sharpening stones are made from aluminum oxide and are rock-solid. As such the stones quickly remove material and hardly wear out. Boride states that the T2 collection is the best collection to sharpen stainless steel. You can, however, also sharpen other types of steel with these sharpening stones. You can use the sharpening stones with water or sharpening oil. Make sure, however, that if you use sharpening oil once, you always need to use sharpening oil! Water is not as effective in sharpening which has already been used with sharpening oil.T2 series stones are made of aluminum oxide and use a very strong bond. As a result, these stones are high-performance and their wear rate is below average. Boride T2 is recommended for working with stainless steel. Characteristics Material: aluminum oxideSize of stones:150x25x6 mmSize with blanks:160x25x9 mmGritness: F150, F220, F320, F400, F600, F800, F1000, F1200Boride stones should be used with one of these lubricants: Refined olive oil Oleic aсid TSPROF Liquid for abrasive stones These stones suit Blitz, Blitz 360, Kadet, K03, Edge Pro, and Pioneer. Compatibility: For Blitz Compatibility: For Pioneer Compatibility: For Kadet Compatibility: For K02 Compatibility: For K03 Compatibility: For K03 Pro