 Hi, I'm Sandrine, head educator and test coordinator at Proneels. Today I want to tell you more about the Proneels Master Files. So, as a Nail stylist, we do a lot of filing work, and it's very important that we choose the right file. To choose the right file, there are two things you have to consider. The first thing is the grid of the file, the second thing is the shape of the file, and those two things together will decide how you should use the file. The Proneels Master Files exist in three different shapes. The straight shape, the banana shape, and the half moon shape. The straight shape is used to file the free edge of the nail to obtain the desired nail length and shape, which can be square, oval, squabble, almond shaped, or any shape your client wants. This file is not used on top of the nail. To shape surface of the nail, you need to use a banana file. Thanks to its special banana shape, you can easily shape your builder gel on top of the nail without damaging the critical area. The half moon shape is a combination of the straight file and the banana file in one single file, which is very practical. You use the straight side of the file to shorten and shape the free edge of the nail, and then simply flip the file over to the wrong side to shape the surface of the nail. The master files come in four different grids. The 240 grit, which is the smoothest file, the 180 grit, the 100 grit, and the 80 grit, which is the roughest file. But first of all, what do these grit numbers really mean? Well, think of it as a filing paper, where the little grain particles determine the roughness of the file. The grit number of a file refers to the number of grain particles needed to fill up a small area of file surface. The lower the grit, for example, 80, the bigger the particles, and therefore the rougher the file will be. A higher grit file, for example, 240, needs many more particles to fill up the same surface area, which means the particles are smaller and will give the file a smoother feel. So the higher the grit number, the smoother the file will be. And the lower the grit number, the rougher, more coarse the file will be. Let's have a look at the grit file file. The 240-240 grit is the softest file in the master file range and is ideal to file the free edge of the natural nail. The 240 grit master file is available in the straight shape only, because natural nails should not be filled on the nail surface itself. The 180-180 grit is a medium soft file ideal for applying the finishing touch to perfect the shape of your gel nails. This file is also suitable for two nails and is also used to open the seal before soaking off so polished nails. It is available in straight, banana and half-moon shape. The 100-100 grit is ideal for fast and easy removal of gel nails, thanks to its rough surface is very efficient for shortening and shaping gel nails. At first use, they may feel coarse, but you simply need to rub two files together to get started and you will love it. These files also come in all three shapes, straight, banana and half-moon. The 80-80 grit file is the coarse file in the master file range. This file is perfect to remove, shorten and shape very hard surfaces like ferritic gel or acrylic nails. These files come in two shapes, straight and half-moon. It is important to choose the right file to enjoy the maximum benefit of your master files. When using a grit which is too soft, you will automatically apply too much pressure. I will not be able to enjoy the file as long as you could have. What's so great about the master files is once you make the right choice, you will find they are very durable and you will do lots and lots of clients. And for your clients, it's also very nice because it feels so soft on their nails. So remember girls, choose wisely.