about this projectSAFE AND PREMIUM MATERIAL - Our thumb sucker is made of food grade silicone material, reliable and durable for one month, 100% non-toxic for babies. There are no metal parts in the product to avoid accidental injury to the baby. The hardness of the thumb guard is also soft enough to ensure that it does not affect the growth of baby teeth, but breaks the habit of biting the thumb.ERGONOMIC DESIGN FOR KIDS AND BABIES - Designed for kids 4 months+, this adjustable thumb sucker is a natural and comfortable way to break the thumb sucking habit. The sucking thumb stopper is designed with an adjustable wrist strap to fit wrist widths from 1.95 to 1.5. Tightening the wrist strap can also ensure that the thumb sleeve will not fall off too easilyREUSABLE AND DURABLE - If you want to know how to keep your thumb sucking stop clean and hygienic for the next use, you can sterilize the thumb protector in boiling water. Our products are made of high-quality silicone, which can withstand high temperatures below 180, ensuring that no harmful bacteria will remain on the product. It is recommended to clean the thumb plug at least once a day.