Purchasing instructions: The product procurement is from the official website of Moment. If the spot is marked, the goods are taken for shipment within 48 hours. After the order is booked, the goods are shipped 3-4 weeks after the order. Please consult customer service for details!All the filters in the link are 37 mm caliber. It cannot be used alone. It needs to be used with the 37mm filter rings to use the mobile phone case!Overseas purchasing products do not support 7 days without any reason to return and exchange. Once you place an order, you do not accept any reason for returning, please place an order with caution!