Must have upgrade!
These guards must be purchased with the the new Snap Blade. The guards and the blades have magnets in them along with 'locking tabs '. The magnets hold the guard to the blade and the tabs keep them meshef together. Together, these two accessories fix the only complaint I've had with the Brio: difficultly changing the length guard. No more guessing if the guard is in place it literally snaps itself into place. In addition, if I pressed a little too hard with the old system, the guard would pop off. That doesn't happen with the Snap Blade/Guard. Perfectly engineered upgrade!
The last item I have on my Brio wish list is a pivoting head along with a button to prevent the head from pivoting for those that don't want that feature.