Oyster Shells, Fine Grade, Kaki-gara, Oyster, Calcium, Bore, Borei Customers who are repeat buyers will receive a special offer, so please let me know in the comments before purchasing. I am also selling the same item on Yahoo Flea Market. Fine grade is oyster shell with a size of 0.5mm to 4mm. 200g is about 250ml. The prices and quantities are as follows. Please tell me the desired quantity in the comments. There is plenty of stock. 200g: 300 yen 300g: 360 yen 400g: 420 yen 500g: 470 yen 750g: 600 yen 1000g: 720 yen 1500g: 970 yen 2000g: 1170 yen 3000g: 1410 yen 4000g: 1630 yen 5000g: 1830 yen I also sell different particle sizes. If you wish, I can also include samples of coarse grade or powder as a trial, so please comment. The salt has been washed away, and then it has been heat-dried at around 500 degrees Celsius and sterilized. The main component of oyster shells is calcium carbonate. For calcium supplementation for small birds and chickens. For adjusting the alkalinity of horticultural soil. For aquarium filter media and alkalinity adjustment. I couldn't think of any other uses, but I decided to sell it. Raw materials: 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% In addition, it contains trace amounts of manganese, boron, zinc, copper, iron, molybdenum, etc. When used as feed for 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 precaution.