Right size and shape. Ribs definitely help keep soap pucks in place.
Ease, speed, and quality of lather.
I’ve historically always had bad razor burns. But that stopped as soon as I’ve started using this product. I’ve gone like 5 years of alway using it. A container lasts a long time. Highly recommend it.
"The Astra Superior Platinum 'Green Pack' is the ultimate five-star shaving blade because it perfectly balances high-end sharpness with an incredibly smooth, platinum-coated glide that gives you a professional, irritation-free shave every single time for a fraction of the cost."
The 7 O'Clock Black (Super Platinum) is a total beast for a thick beard. While the Yellows are like thin, fast lasers that slice through hair, the Blacks feel more substantial and way smoother. They’ve got this platinum coating that makes them glide, so you get all that sharpness without the skin irritation.
Compared to the Yellows, the Blacks are definitely the "premium" version—they stay sharp way longer and don't get that "toothy" feel after a couple of shaves. They’re almost like a Kai, but the Kai is still the king if you want pure, raw aggression. The Black is more of a refined power hitter that gets the job done without the bite.