for Shimano R8100 R9200 Double chainring 58T 44T BCD110 12 Speed Dual Driveline 

Note: this double chainring is for Shimano R8100 R9200 only, 12 speed

Features:

Material:Al7075-T651

Teeth:55T 40T

weigth:224g

package include:1set chainring with bolts