Natural cuttlebone from squid Cuttlebone Each one is washed with water, sterilized in boiling water, and sun-dried. No additives are used, so you can use it with peace of mind. Cuttlebone 13.5cm - 21cm Set of 6 Slight scratches and stains. Some ink stains as well. There is a possibility of chipping or breaking during shipping. Please understand.