Each family has keys, and everyone needs to use them. However, the keys we see in our daily lives are almost uniform, with little difference in appearance. When we have too many keys, we ourselves find it difficult to distinguish which key opens which lock. Therefore, it feels like such versatile keys should have been widely used long ago. The head of these keys can be various patterns, bizarre and wonderful. This way, even if we have a lot of keys, we still know what each key is for. Moreover, such keys are more like the key decorations we usually use, and carrying them around is also a form of decoration.