The feed wheel is molded with a tough polycarbonate resin. It’s one of the toughest plastics available. When a machine is properly used and cleaned the wheel will last between 500,000 and 1,000,000 coins. This is $5000 to $10,000 dollars worth of pennies. Some users have been able to make their wheels last well beyond this number. The symptoms of a worn out wheel are that it allows pennies to double up under the wheel, causing the feeder to “labor” and can wear out the hopper motor prematurely. A wheel is a good spare part to have on the shelf in case it shows signs of wearing by doubling coins, especially if you are going to do a large sort quantity on a weekend. Order a wheel with your machine and save the shipping charges later.