This is a string for rooting. As these items are handmade, there may be slight differences in length. The size of the ring may vary. The root string is very vulnerable to water, so if it gets wet, it will be damaged regardless of the number of days. The strength is also very weak compared to modern straps. Pull the string on your phone to make it easy to break. We do not have strings that cannot be cut or worn with root ropes, so please be aware that if it gets worn out, you can replace it with other root strings.