There are various makes of round baler available for 2-wheel tractor, they are all powered by the Power units PTO, some are pulled and some are pushed. Basically the round baler picks up the cut material and rolls it into a tight roll inside the baler, the bale is then wrapped in string, or on some models net. Once the bale has been made the baler opens up and the finished bale is then ejected or removed. Round balers can be used for baling all manner of cut material, grass to make hay or silage, bracken, reed etc and even leaves with a net wrapping. Round bales are usually about 50cm high and 50cm long with a variable weight up to 20/25Kg. Ideally you should use a minimum power unit of 10HP and it must be fitted with brakes.