There are four different sides, they are numbered and you "file" your nail which each side in order. You swipe it over the top of the nail though, not the typical filing for length and shape.

The first step is a nail file. Use it to shape and file your nail tips. Follow the other three steps in order. Buff the surfaces of your nails to reveal smooth, shiny nails.

Use the first side to file your nails down.
The remaining sides should be used on the top face of your nails (not the edges) to remove ridges and make your nails shiny.
Use the different faces of the buffer in the order they are numbered.

Gently rub the surface of your nails with the black side, followed by the pink, then the orange, finally the white.

Ok, I have one slightly dysfunctional hand. It's hard to see, but I am aware that I am not ever going to be the lovely manicure type because of it, no matter how much I might yearn to be. So, I clip my nails pretty short once a week and buff the tips to smooth them out. With this particular buffer, the job is sooooo easy. Sometimes, I don't even need the clippers, I can buff down a bit, allow a tiny bit of length and wow!, no breakage! My nails shred, so having the series of grits lets me clean all that off and my nails are so much stronger with completely smoothed out tips.

Use each side in order. Make sure to cover the nail evenly. Should only be a couple of seconds per nail per side. You should have a great natural shine after side 4!

You just follow the numbers on the buffer. You can't miss! You begin with side 1 and then move on to 2, 3 & finish with side 4. Your nails will be beautiful! Have fun!

There is four sides you use side 1 through 4. First is side 1 which is file then side 2 smooth then side 3 buff and side 4 shine!

It works the same. The colors are the only noticeable change.

I've had both, the newer version is grittier then the older one, I just use it with a lighter hand. They're both the same size, and give the same results.

they seem to just be changing the colors; my old one wore out not sure how long this one will last

From my experience its the same thing as the old one. The Old one bend quickly and in about 3 months or so I got to replace it. This one isn't bending but I just got it in December. Also I don't use this every day, once every 2 weeks or less.