Oyster Shell Powder, Kaki-gara, Calcium Powder, Borei-ko, Oyster, Borei Repeat buyers, please let me know before or after your purchase. I am also selling the same item on Yahoo! Flea Market. 150 grams is approximately 170ml. I have plenty in stock. If you need more than 150g, please comment before purchasing. I will add 30 yen for every 50 grams increase. Please inquire for discounts depending on the quantity. I also sell by grain size. I can also include samples of coarse or fine grains as a trial, so please comment if you need them. The oyster shells are sterilized by heating and drying at around 500 degrees Celsius after washing away the salt. The main component of oyster shells is calcium carbonate. For calcium supplementation for humans, small animals, birds, reptiles, and amphibians. For dusting and gut loading of insects for food. For adjusting the acidity of horticultural soil. At home, I mix it with tea or coffee, and use it for dusting Dubia roaches (Argentine cockroaches) and mixing into the paste food for toads. Ingredients: Oyster shells (Miyagi Prefecture) Alkaline content: 50.0% Nitrogen: 0.2% Phosphoric acid: 0.15% Potassium: 0.03% Calcium: 94.8% Magnesium: 0.40% Silica: 3.09% Other trace elements include manganese, boron, zinc, copper, iron, and molybdenum. Shipped via Yu-Packet Post Mini. When used as food for humans or living creatures, there is no expiration date or best-before date for oyster shells, but please use them within 2 years of opening as a guideline.