The pop bubble bracelet keychain is made of high-grade silicone material that is harmless, soft, durable, odorless with a smooth rubber surface. You can effectively relieve anxiety and stress by pressing on both sides and making popping noises. And it's perfect for children and adults, especially those with autism, ADHD and inattention. Besides, It's a great gift for birthdays, Christmas, Thanksgiving. 5 33/64" L x 25/32 " W