-6061 T6 aluminum alloy. -100% CNC trueness. -Designed for one-bolt attach cromoly cranks. -3/32" tooth profile. -5 mm thick. -Available in 36/45T. -Black anodized       -6061 T6 aluminum alloy. -Available in 4-Arm (104 mm bolt pattern) and 5-Arm design (110 mm bolt pattern). -5 mm thick. -34/45T. -Black anodized         -6061 T6 aluminum alloy. -5-Arm design -110 mm bolt pattern. -36/40T. -Black anodized       -4 mm economical stamped and machined chainrings. -5-Arm design. -110 mm bolt pattern. -Available in 34/45T. -Available in anodized black, silver, red, blue, green and gold.