NATURALLY MADE Sand perch covers and gravel paper for bird cages are made of natural safe & non-toxic raw materials,which are sand,base paper and food grade glue.Which adds beneficial calcium to your bird s everyday activities. It s okay for your pet to gnaw at the covers; they re getting calcium, similar to pecking at a cuttlebone. FITS 3/4 DIAMETER PERCHES Length=10" /0.78"Diameter 25cm*2cm ,fit 0.5" - 0.75" diameter perches Can also be used alone , and come together as a 12 Pack. They're designed for Parakeets, Lovebirds , Parrotlets, Finches, Canaries, and other small birds. ALL LIFE STAGES Suitable for the entire life stage of birds, which need to polish their claws and beaks;Provides a natural and easy way to care for your pet's nails. HYGIENIC COVERS FOR PERCHES These covers for bird cage perches help to keep your feathered buddy's nails clean and trim, so you have less maintenance work to do. HELP DIGESTION Provides grit to aid in digestion. When ingested, the grit helps digestion in the crop Supporting his health and well-being.Suitable for a variety of bird cages such as parrots, parakeets, cockatiels, love birds, finch, canaries cages.