Shimano Cassette Sprocket CS-HG41 7-SPEED, 11-13-15-18-21-24-28T, No Packaging

Lighter weight (compared to CS-HG51-8I / HG40-8I / HG30-8I / HG30-7I)
Long leg spacer for further weight reduction (CS-HG51-8)
Enlarged sprocket window design for lighter weight
Variety of gear combinations
HYPERGLIDE
Quick assemble
13T flat sprocket fixed with lower gears