FLIPPER STANDARD SCRAPER BLADES: These replacement blades for your Flipper Standard fish tank cleaning tools are suitable for use on glass fish tanks from ¼” up to ½” (6mm - 12mm) thickness. | STAINLESS STEEL BLADE: Suitable for use on glass aquariums only, the stainless steel Flipper Standard algae scraper blades are quick and easy to install, snapping into place in 1 direction only. | KEEP YOUR TANK SQUEAKY CLEAN: These Flipper fish tank cleaner scraper blades are ultra low profile for reaching difficult or tight areas of your fresh or salt water fish tank. | SCRAPER BLADE MULTIPACK: This pack of 2 replacement blades for fish tank cleaning are replaceable and interchangeable. Change your blades every 3-6 months to keep your Flipper cleaning like new! | 100% SATISFACTION GUARANTEE: If you aren't satisfied with your Flipper aquarium accessories for any reason, contact us within 60 days for replacement or refund. Must be sold from an authorized dealer.