This eggcrate can be used in filters, sumps, and to make coral racks. Eggcrate must be shipped as oversized. This means it will be shipped at a higher shipping weight than the actual sheet weighs. It is more cost effective to order multiple sheets or to have a single sheet cut in half. We can cut a sheet in half for no charge. Actual shipping on this item will be determined at the time of shipment with FedEx. Customer is responsible for shipping costs.