I found some plastic mixing bowls at Walmart that I flipped over and cut an entrance hole in. I then used a lighter to melt any sharp edges. I use these in my racks. My smaller snakes like them. I have a ceramic flower pot in with my son's 20 gal tank that I took a hammer to crack an entrance hole at the bottom (It cracked the pot in several places as well but I gorilla glued the whole thing back together). My larger snakes that I have in my racks do not get hides.