Contains two (2) belts. The B belt fits Sanitaire PROFESSIONAL SL4110 and SL4410 series upright vacuums. Replacing a worn or damaged belt maintains optimal brush roll performance to maximize carpet cleaning. It is important to check the belt periodically for any signs of wear that can result from normal use over time. The tighter or newer the belt, the better the vacuum will perform. 

Also fits Bissell #1937T, #1451T

These belts are actually the same as the Bissell Style 7/9/10 belts and are made by the Bissell company for Sanitaire and are labeled as Bissell belts.