42T

 Precision CNC machined AL7075/T6 Shifting ramps and stainless steel pins on outer ring Lazer etched logo with CNC machined silver detail 130mm 5-bolt 42T AL7075 9/10s Triple Black/Silver 9/10sp Standard

 6061-T6 alloy construction 8 and 9-speed compatible Silver anodized finish CNC Made in the U.S.A. 130mm 5-bolt 42T 6061-T6 Silver 8/9sp Standard

 6061-T6 alloy replacement rings 8, 9 and 10-speed compatible Black anodized with silver CNC machined teeth Made in U.S.A. 130mm 5-bolt 42T Non Ramped Black/Silver 8/9/10sp Standard