Love these! Carbon steel is a different type of sharp, its generally harder and stays sharper longer than stainless steel. Carbon steel can also make a finer edge - the only catch here is the high carbon content makes these more suceptible to rust. These feel a step above Silver Blues in terms of sharpness, but just as smooth. Make sure you wipe them down after use and they should last you 5+ shaves (YMMV). These also are just badass looking blades and pair great wil DLC coated razors like Ikon DLC coated razor or Carbon Shaving Graphite Ti's (look amazing). Keep these in rotation! you won't be dissapointed.

4 stars becuase I can only get 3 shaves out it instead of 4 the 4th shave is very dull and the blade tugs at my face where as the other treet blades don't. I rinse and dry the blade after use so my blade didn't rust like other have stated. Thays becuase they don't know about carbon steel and isn't stainless and has to be wiped and dried before storing away any moister or water left on the steel will patina and rust. Very sharp and smooth blade I like the treet platinum and new steel blades more but the carbon cuts just so cleanly it feel sharper than it is even though it's a very sharp blade. Also becuase it doesn't have a coating like the new steel or platinum from treet it does seem to feel not as smooth on the face but is a smooth cutter. The carbon just has a different feel then a stainless blade does for which it should. But remember it's a must if you use the carbon blade you must wipe it down and dry w a towel otherwise you will have rust in a few days. I get less use out the treet carbon vs other blades otherwise a mild to medium aggressive blade.

Wow, I'm so impressed with this blade! I'm shocked that blades that cost so little can work this well. I love Kai, Personna blues, & Nacet. I have not used them in all my all my razors but are perfect for my red tip and my slim adjustable. They do rust after 2-3 shaves but who cares? They are so cheap !

Its a sharp blade but in starts to RUST after 2 shaves. Found out what carbon steel is all about. Will never buy it again.