This is a necklace that can be used as a teether for babies. The string is made at a length of 70cm, but we can also make it in your desired length. It is made entirely of silicone beads, which are safe and secure for babies, FDA-approved, and BPA-free. Made of silicone, it can be washed and kept clean. It is designed to come off if pulled. If you are concerned about the knot, we can make it without tying the clasp. If you prefer the beads not to move, please comment and we will tie and fix both sides of the beads. We will discount 100 yen for combined purchases with other products. You can purchase immediately if you have no questions. Feel free to send your requests via message after purchase. Thank you.