The buffer measures 3.5"x2.5" and is just over 1/2" thick. The tear drop shape fits nicely in my hand, and the tapered point allows you to get right to the edge of the nail.
Here's a look at my nail before, during and after. In the "before" photo, you can see that my nail has more of a matte finish, and the light reflection on the right side of the nail shows some vertical ridges. After using the grey/green side of the buffer, the nail surface is very lightly sanded and smoothed. The white side of the buffer is then used to further smooth, and deliver a high gloss shine to the nail.
A side-by-side of a nail that was buffed and shined, and a nail that was not.
I've got a box full of buffers, and nothing gives me results as nice as this one does. I normally reach for a 4-sided buffer (Tropical Shine brand from Sally Beauty), but the Revlon product is much easier to hold and manipulate, and the end result is so much better. The buffing side of the Revlon buffer is gentler on my nails, and the shine side delivers an unbelievable glassy finish.
After using this product, my nails look like they have a layer of the shiniest top coat imaginable on them. I love that it doesn't take too much off of the surface of the nail when buffing, because there are many buffers that can cause damage if you're not careful. The shine side also does a great job of refreshing nail polish on your nail after you've worn a color for several days. It shines them up and makes it look like you just finished your manicure. The shine lasts for three days on my bare nails, just like it states on the packaging. The only negative point I can report about this product is that the tip of the tear drop section is the first part to start wearing away. That's the part that works best on the edges of your nails, so I then use a section further up the side, which doesn't enable me to get as close as I'd like.