Thank you for viewing! This is a bird athletic toy for parakeets, parrots, etc., made using natural Japanese walnuts. It is approximately 16 centimeters long. Made from the shells of natural Japanese walnuts from Yamanashi Prefecture. Because they are Japanese walnuts, they are hard. Before being cracked, they are so hard that they won't break even if you hit them with a hammer (this does not apply to the product, as it is already split in half). Please consider this handmade item with understanding. Instant purchase is OK. #birdtoy #birdathletic #birdgym #parakeet #toy