Material: Black shell Size: 11.5mm Due to the natural material, there may be some unevenness. This is the price for 30 pieces. * One piece costs 20 yen. You can combine them with other items in your desired quantity. Please let me know in the comments. I will create a dedicated page for you. * In that case, please make sure the total is 500 yen or more. * If you purchase 1000 yen or more, you will receive a 10% discount.