Oyster Shell Powder, Oyster Shell Calcium Powder, Cuttlebone Powder, Oyster, Cuttlebone There are benefits for repeat customers, so please let us know in the comments before purchasing if possible. We are also listing the same item on Yahoo Flea Market. For calcium supplementation for humans, small animals, small birds, reptiles, amphibians, etc. For dusting and gut loading of feeder insects. For adjusting the acidity of garden soil. At home, I mix it into tea or coffee, use it for dusting dubia roaches (Argentine cockroaches), and mix it into the paste food for toads. 150g is approximately 220ml. Prices and quantities are as follows. If you need more than 200g, please tell us the desired amount in the comments. We will change the price. We have plenty of stock. ●150g: 300 yen ●200g: 330 yen ●300g: 390 yen ●400g: 450 yen ●500g: 500 yen ●750g: 640 yen ●1000g: 760 yen ●1500g: 1000 yen ●2000g: 1260 yen ●3000g: 1700 yen We also sell products by grain size. We can also include coarse or fine samples as a trial, so please comment if you need them. Sterilized by washing with salt and then heating and drying at around 500 degrees Celsius. The main component of oyster shells is calcium carbonate. Ingredients: Oyster Shell (Miyagi Prefecture) Alkalinity: 50.0% Nitrogen: 0.2% Phosphorus: 0.15% Potassium: 0.03% Calcium: 94.8% Magnesium: 0.40% Silica: 3.09% Also contains trace amounts of manganese, boron, zinc, copper, iron, molybdenum, etc. When used as food for humans and animals, oyster shells do not have an expiration date or best-by date, but please use them within 2 years of opening as a precaution.