The price is based on the number of belts you need for your mower.
DDM50/55 1 BELT Connected to the generator
2.0 1 BELT (680B) Connected to the generator
SPYDER 1 BELT (650B) Connected to the generator
DDM80 1 BELT (635B) Connected to the generator
DDM100 30" CUT 2 BELTS (660 and 635B) Connected to the generator
DDM100 40" 2 BELTS (785) Connected to the cutter shaft
DDM100 40" 2 BELTS (B815) Connected to the cutter shaft
DDM100 40" 2 BELTS (B815) Connected to the generator
DDM100 50" 2 BELTS (930-B) Connected to the cutter shaft
DDM100 50" 2 BETLS (1070) Connected to the cutter shaft
DDM100 50" 2 BELTS 5380 Connected to the generator