Product Specification: Product name: Red Worm Feeder Material: Acrylic Color: Clear Size: 15 X 11 X 5 CM Product Features: Made from high quality glass, it is high intensity. Easy to use,easy to clean,not easy to fall off. Protect live food spread to go to throughout in aquarium tank. Provide good feeding environment for fish in the tank. Applicable to all types of freshwater and saltwater aquarium. Package Includes: 4 x Aquarium Nematode Feeder4 x Suction Cups Easy to install: 1. Choose a location, wipe it clean, and suck it on the tank wall. 2.Mount the white suction cup parts on the suction cup. Sweet Tips: 1.Please allow a little size error due to hand measure. 2.Color may be a little different due to monitor and light brightness from pictures. Thank you for your understands.