Disposable twin blades. Throw it way after a couple shaves, you will always have a sharp blade.
a tip. Dry your blades after using. I can use a cartridge for months. Even better is drying them and then putting a litttle oil on them. a drop of olive oil.
I got a tough sandpaper beard. Really love the newer blade technology and used to purchase the Gillette Mach 3 blades but I’m also a cheapskate and don’t enjoy forking over the $12 for four blades. I’ve switched to the disposable Schick Slim Twins. I put moisturizing lotion on before the shaving cream or gel and this helps smooth the shave and I can get one month out of each razor. Dry the razor blade off with the towel to help it last longer. Works for me....