These pans won t rust! The pads are reusable and there is no need to melt sticky wax, The covers close up for the day, The Economy pan is perfect for the beginning dissection project earthworms small frogs clams or grasshoppers - 10"" x 7"", The Standard pan is perfect for general use and medium size specimens such as perch frogs and crayfish - 11 1/2"" X 7 1/2"" The Deluxe pan is excellent for larger specimens fetal pigs bull frogs and star fish - 12 3/4"" x 9"", American Educational Products have a lead ship time of 21 days, SKU: AMED1294