The precision machined carbon steel gears are manufactured to eliminate slippage and wear, and won't rust or collect germs. The cylinder is easily removed for clean-up. The hard plastic piston with a built-in release valve allows air to escape, making your job even easier. These are reliable, high performance, gear-driven stuffers that will last. For additional protection, the 5 lb. Sausage Stuffer now includes a protective gear box cover. This innovation takes safety and durability to the next level by ensuring your gears and your food are well protected.