Mini stands for mini chain or .043[1.1mm] chain. New lightweight bar 25% lighter than comparable bars and comes in both 3/8 picco [lo pro] or 1/4 with the difference being it is running .043 [1.1mm] chain rather than the standard .050[1.3mm]. This gives a narrower faster cut. If you are running the 1/4 .043 chain ensure you have a 1/4 drive sprocket.
The combination of this particularly narrow guide bar with the 1/4″ Picco chain (designed especially for cordless chainsaws and the MS 150/MS150T/MS151/MS151T and other Stihl battery saws and pole saws), offers considerable savings in weight coupled with improved cutting performance. Like all STIHL guide bars, it is made of high-grade chrome molybdenum steel.
Also check out the Pather Mini Bars [only in 1/4 .043] which are a little stiffer than this Stihl bar but still carry the same thin cutting 1/4 .043 picco chains.