What Our Gearhead(R) Experts Are Saying:"I noticed the extra flex in the BOLT Skin + Shave Cartridge Refills Black Edition immediately compared to the standard version. The blade system follows every contour without skipping, and the aloe and vitamin E strip keeps things comfortable all the way through the pass."The Black Edition razor deserves a refill that matches its standard, and the BOLT Skin + Shave Cartridge Refills Black Edition are built exactly for that purpose. Dropping a worn cartridge for a fresh one is the simplest performance upgrade in the routine, and with three per box there is always a replacement ready before it becomes an afterthought. What sets these apart from the standard refills is an additional two degrees of flex built into the cartridge, allowing the entire blade and lubricating system to pivot to nearly 90 degrees relative to the handle. That range of motion lets the five Swedish specialty steel blades stay in continuous contact across uneven terrain without the pressure adjustments that cause nicks and irritation. Aloe vera and vitamin E surround the blade stack throughout, keeping the skin barrier protected from the first stroke to the last.