Teflon Propeller Paddle With Four Arm Blade For Benchmark 20L and 40L Overhead Stirrers, 1/EA. This Benchmark Scientific Optional Teflon 4 Arm Propeller is designed to enhance mixing efficiency in various laboratory applications. The propeller is made of durable Teflon material, ensuring chemical resistance and longevity. Its 4-arm configuration promotes thorough mixing of solutions. Compatible with select Benchmark Scientific equipment, this propeller is easy to install and use, providing reliable and consistent mixing performance. Upgrade your stirring capabilities with this high-quality Teflon propeller for precise and efficient mixing in your lab.