The 540 horsepower John Deere 458 Round Baler is one of the most popular models for round-baling straw. These machines have a diamond-tread design that helps prevent slippage and maintain a constant length of the belt. The machine also has a self-cleaning, trough-type lubrication system. The four-inch-wide belt roll provides an easy way to return any loose hay to the bale. The machine’s design also prevents the buildup of hay and debris in the front of the baler.