Magnaturals Small Worm Feeder 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 up to 1/4" thick. Maximize terrarium space. Create exciting terrariums with multiple units.