Our ledges are 3d printed from PLA plastiic and use 100% aquarium safe suctions for attaching. Ideal for attaching mosses, buce or other rhizome plants to displlay in your aquarium They help complete a scape without taking up floor space. Shrimp love to use them as platforms. Try feeding directly on a ledge or attaching a piece of leaf! Comes in various sizes, please check options to the right. Pack Size: 1 Ledge, 3 Ledges Dimensions: 1.5" x 3"