We offer chainsaw blades to fit STIHL chainsaws (available for purchase only). They come in three lengths:
12" blade fits the STIHL MS180 with a 3/8" low-profile chain
14" blade fits the STIHL MS250 with a .325 pitch chain
16" blade fits the STIHL MS250 with a .325 pitch chain
 
If your blade is a bit dull but not ready for a complete replacement yet, try a chainsaw file to sharpen it up.