It is made of food grade silicone, BPA free, non-toxic, no smell, let moms more assured. The bump texture teether design helps your baby relieve sore gums and protects babies from scratching themselves, while protecting them from chewing on their hand. Soft breathable drool-absorbing fabric, easy to clean and dry, and is machine washable. The mitten is just like a toy. When baby wears and bites it, it would make a slight noise like a candy wrapping paper being opened. The stimulating crinkle sound would be more attractive to babies. Rich color settings can stimulate baby's visual sense. The mitten comes with an adjustable velcro strap to prevent baby from dropping it on the ground. Teething toy for babies 3-18 months old or until they are able to remove the mitten themselves. Can be worn on left or right hand and you can choose one or a pair to buy.