MagNaturals are locked against terrarium glass with Mega Magnetic Power!Mojave Red Colored Small Worm Feeder Ledge.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.Size 6.75" x 4.5" Ledge 3.5" cup.