Magnaturals Small Planter Ledge Granite - Magnetic Decor Install or relocate in seconds. No glue or velcro 100% non-toxic materials. Made from Polyurethane Foam Resin. Easy to clean. Magnetic force guaranteed for life. Works on habitats with glass 1/4" thick. Maximize terrarium space. Fits standard 4" Pot. Create exciting terrariums with multiple units.