Nail tips come in sizes 1-10 and you will get 7 of each size. They will fit all types of nails from very flat to very curved without breaking or cracking. Tips come in a hard Perspex/plastic reusable box with 10 compartments that is tough and sturdy! It is mega easy to apply these tips. File, shape and prepare the natural nail as usual and then place the tip on the most natural place on the nail near free edge. Just apply your chosen product on top and finish as normal!