• The SISIS Truline Marker has a continues rubber belt which, with the 3 in (76mm) belt fitted provides 18in (116cm²) of contact with the ground, giving positive adhesion to the surface and ensuring a continues supply of marking liquid, under the most difficult conditions, on wet or dry surface. The line of the belt gives a positive guide to steering, making it simple to keep a straight line yet easy to steer around circle. Three widths of belt are available, 2in (51cm), 3in (76mm) and 4in (102mm), to cope with most requirements. These can be changed very quickly without the use of tools.