API Algae pads are a great way to remove algae from your tank. Their "scraper" is just their pad with a handle. The handle is about 14.5 inches long and the pad is about 3 inches long. The stand alone pad is about 3 x 3 inches and about an inch thick.
Rivers to Reef says: If you have a can of elbow grease ready these work great! Brown algae is not a problem, but green encrusting algae or coraline will require some work. Please make sure you order the correct type for your tank. The blue pad is for glass and the white is for acrylic. Using the blue pad on an acrylic/plastic tank will result in a scratched tank and a sad aquarium keeper.