These great moss ledges were printed by Chris Roma. He took great care in thinking of of everything! Plenty of water can be circulated through while maintaining a good grip on your moss fronds. He also made sure to include plenty of "teeth" on all sides in which to thread your line through to keep it in place and keep it tight on the fronds. There are longer teeth on the sides and center that you can just weave your moss in like a comb without gluing or using string. 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 a smaller sized suction cup that is approximately 1 inch in diameter so that it is not obtrusive. The suction cups fit tight in the ledge slots to prevent slipping out.