Thank you for viewing! This is a handmade item, so please understand. Perfect for pretend play or display! To ensure children can play safely, I've used no glue, only felt, thread, and cotton. As it's handmade, there may be slight variations in size, but the donuts are approximately 7cm in diameter. For use with a string, as an educational toy, I can provide various strings for an additional 50 yen each, if desired. I plan to add more items in the future, so please feel free to make requests!