Small Magnetic Powered Worm Feeder Ledge. Great for all small to medium reptile, amphibian and invertebrates who feed on small worms like meal worms, butter worms and wax worms. The specially designed worm cup has a "lip" around the top that prevents the worms from escaping. The cup is removable and can be cleaned or replaced. Key Features. Install or relocate in seconds. Removable Cup. NO glue or velcro. 100% non-toxic materials. Magnetic force guaranteed for life. Easy to clean. Maximize terrarium space. Create exciting terrariums with multiple units... then recreate them at will!