Use for any chicken, duck or medium to large sized eggs with great stability. Holds up to 6 eggs. Each shipper is designed to cushion and offer ample spacing for the best hatch rates possible. Simply remove foam inserts. Cut 4 of them in three sections. Insert one section back into the shippers holes. Place 1 end following contour of shipper in each space. Set cover section over egg. Does not require pads if shipped 2 per box.
Two of these shippers fit in a #4 USPS priority box to be able to ship 12 eggs. https://store.usps.com/store/product/shipping-supplies/priority-mail-box-4-P_O_BOX4