Check the listing for details. The BASIC Set / 17mm: CBN-stone Apex Edge Pro Ganzo Ruixin Pro, TSPROF Hapstone. Color: Silver, Condition: New. Listed at 287.37 USD. Diamond & CBN-stones from Ukraine have some difficulties:*****Since the PDTools (UKRAINE) factory is experiencing difficulties of war, the plant reserves the right not to paint aluminum backing plates for sharpening stones, so some sharpening stones from Ukraine may not be painted and may be differ from the photos, but HOWEVER THIS DOES NOT AFFECT THE PERFORMANCE CHARACTERISTICS OF THEM OF ABRASIVE MATERIAL inside THE SHARPENING STONES!Attention:The guarantee of the factory products from Poltava city PDTools (UKRAINE) is their gluing on a 4 mm backing plates in the factory way - for other bars, glued on a 3 mm backing (Hapstone, Gritomatic etc.), the factory DOES NOT BEAR RESPONSIBILITY AND DOES NOT GIVE a factory guarantee for those sharpening stones: Attention: Warning: PDTools trademark on the back of the aluminum's backing blanks 5/32” = 4 mm (See Attached picture from their booklet) high, can guarantee that you have purchased the PJSC Poltava Diamond Tools Superabrasives factory’s product for the American market from the Authorized dealer in North America (See Attached photo of our certificate)!*******https://www.youtube.com/watch?v=jAk0VASJx0k*******https://www.youtube.com/watch?v=qtsX5jxz6g8*******https://www.youtube.com/watch?v=3g3pABq_tjM (Explained: the differences between CBN metallic and Diamond resin)*******https://www.youtube.com/watch?v=B3M8Xn-FXiA&t=5s******* FeedBaсk******* ! Mr. Efim Dreer (Canada) - 37 years on the sharpening field, creator of the Flip-in-Sharp rotary mechanism, which allows you to sharpen a knife without removing it from the clamps, said (See the picture): - Yes, guys! Now, in nowadays, CBN stones are the best in the world! Of course, it’s a pity - the era of natural stones like Arkansas, Washite, Lynn Idwall, etc. has passed. Yes, CBN stones do not require frequent leveling and I flatten them no more than once every year and a half... ! :https://youtu.be/B3M8Xn-FXiA?si=PkROKD0h7Hn2N-Hi ! Mr. Michel Lovett (a friend & the partner of Bob Loveless) wrote me response under this video:Mr. LevittNow that I've had a chance to really try these stones, I'm very impressed! I have a lot of diamond stones here. Simple plated stones, Venev Diamond Stones that are an nonmetallic binder along with Jande and Columbia Gorge. Nothing, and I mean nothing cuts like these stones. Fast, but the finish they leave on the blade is crisp like I've never seen before. Even the coarser grits such as the 550 and 650 grits shave well, smooth in paper slicing but have an aggressive nature that has to be felt to believe. So aggressive in fact that care must be taken around the edges. Not for the careless user! I will be ordering more of these stones. The ones shown here are for fixed angle sharpeners, but I do need to pick up a couple of bench stones. It's on the too do list! I can't thank you enough for pepping these stones for me. I already have many hours using them on from D-2, 154-cpm, to M-4 and S90V. These stones are like the Honey Badger. They don't care! Nothing is too tough for the. :