For use on glass aquariums only, these Replacement Mag-Float Scrapers are for use with the Large (MagFloat-350) and Large Plus+ (MagFloat-400) models. This product contains two stainless steel replacement scrapers. 

• Replacement Mag-Float Scraper for MagFloat-350 and MagFloat-400
• Contains two stainless steel replacement scrapers
• For use on glass aquariums only