Living World Hamster Fluff is 100% cotton bedding and nesting material for hamsters, gerbils, and other small pets. Place half the contents of the package in your pet's cage and it will immediately start to build a cozy nest. Add additional fluff as needed. Change when necessary or every 2 to 3 weeks. Size : 28 g (1 oz) Other sizes available : 61282 Living World Hamster Fluff, 60 g (2 oz)