Prevue Pet Products Pacific Perch Cosmic Crunch is a great natural foot exercise perch for your bird. The uneven surface and branch shape of the perch encourages healthy foot exercise while the hard sea shell coating adds texture for grooming beaks and nails. Each Cosmic Crunch perch is made with natural ground seashell to provide your bird with calcium as it chews. Tough and long-lasting, Pacific Perches attach directly onto your cage. Each Pacific Perch Cosmic Crunch small perch measures 6” long and the medium perch measures 9″ long.