Clean glass surfaces. Pro Scraper 3 Slides: Acrylic, glass aquarium; Features: A scraper that keeps glass surfaces clean. You can adjust it to your preferred length. The blade can be changed according to the moss type, aquarium material, and maintenance contents. Comes with 2 types of blades. Set Contents: Main unit x 1, stainless steel blade x 1, normal blade x 1, feeder cover x 1, blade type: Stainless steel blade: For glass aquariums. Removes cleanly from hard moss or lime algae. Normal Blade: Plastic blade that can be used with both glass and acrylic aquariums. Used for general maintenance purposes. Feeder Cover: Open the cover to fill frozen feed. You can serve the target fish in the desired location. Size (approximate): Main body width 3.1 inches (8 cm) x length 15.7 inches (40 cm) - 23.6 inches