this product has small wooden balls inside the bigger balls on the string. one of these smaller ones got lodged in my pigs throat all night and half of today when i got a chance to feed them and check over them. thought he had a uri so i looked in his mouth and discovered this wooden ball lodged in his throat & covered in saliva. he could only breathe thru his nose for who knows how long. thank god my pig is still alive and i caught it in time. DO NOT BUY!