Ferret Nation replacement shelf pans measure 15 5/8 x 21 1/2 and have 3" tall sides. Choose from a prime galvanized or stainless steel construction. Bass Equipment also offers urine guards that attach to the wire of the cage. These guards fit in behind the pans and extend the sides height another 3.5". This means you have an over side height of 6.5". Please note galvanized metal will eventually rust, stainless steel will not.