Oslo municipality c/o the Agency for Urban Environment, shall procure 3 tractors for use in Marka. A fixed service contract will also be signed for five years, with an option for a 5 year service agreement (1+1+1+1+1 year). One large and one medium sized tractor shall be procured for use in Nordmarka and a medium sized tractor for use in Østmarka. Separate contracts will be signed for each of the three parts (sub-contracts). The contracting authority is free to award the sub-contracts to the same or to different tenderers. The duration of the service agreement runs from the date of the approved delivery and hand over of the tractors.