Oyster Shell Powder, Kaki-gara, Calcium Powder, Borei-ko, Oyster, Borei Customers who are repeat purchasers will receive a bonus, so please let me know in the comments before purchasing if possible. I am also selling the same item on Yahoo Flea Market. 150g is approximately 220ml. The prices and quantities are as follows. Please tell me the quantity you want in the comments. I have plenty in 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 I also sell different grain sizes. Also, I can provide samples of coarse and fine grains as a trial, so please comment if you need them. The shells are washed with salt, then heated and dried at around 500 degrees Celsius to sterilize them. 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 it into the paste food for toads. Ingredients: Oyster shells (made in Miyagi Prefecture) Alkaline content: 50.0% Nitrogen: 0.2% Phosphoric acid: 0.15% Potassium: 0.03% Calcium: 94.8% Magnesium: 0.40% Silicic acid: 3.09% Other trace elements include manganese, boron, zinc, copper, iron, and molybdenum. When using it as food for humans or animals, there is no expiration date or best-before date for oyster shells, but please use it within 2 years of opening as a precaution.