These great moss ledges were printed by Chris Roma. Really unique as they allow you to "hang" moss vertically on the wall of your tank. This gives a unique appearance. Plenty of water can be circulated through these ledges while maintaining a good grip on your moss fronds. There are "teeth" on all sides in which to thread your line through and longer teeth on the sides and center that you can weave your moss in like a comb without using glue or stinr. With plenty of venting in the center, it makes it easier to thread the line through for extra security for those shorter pieces as well. These adhere to the tank with two suction cups that is approximately 1.25 inches in diameter so that it is very secure. The suctions cups fit securely in the ledge slots to prevent slipping out.