This is natural pet food's "Bolay Powder" (oyster shell flakes). I bought it for my Java sparrows, but I have too much and can't use it all, so I'm offering it in 500g portions. Please use it for calcium supplementation for birds, soil improvement for gardening, etc. It will be packaged in a double zip-lock bag + a box or a thick paper bag. *My Java sparrows are currently eating it with no problems, but please understand that I cannot be held responsible for any health problems that may occur in your pet due to this product.