These nail drill bits are not only colorful but are also durable. They are very easy to keep clean and sterile. People always ask about them when I take them out. They are not your usual bits they say, they would like a set like mine. I always tell them where they can be bought. They are great for preparing the nail for artifical nail attachments and removing them. They are also great for manicures or pedicures. The set is amazing and at a great price might I add. I have had the set for several months and they still perform as if they are new. I would definitely recommend.