Winters Quick Change Gears are constructed from SAE 8620 Steel, Crown Cut, 1-3/8" Wide. 

Specs:

Teeth: 22/34

4.11 Gear Ratio: Low 2.66 High 6.35

4.12 Gear Ratio: Low 2.67 High 6.37

4.57 Gear Ratio: Low 2.9 High 7.06

4.86 Gear Ratio: Low 3.14 High 7.51

To see other gear sets available, check out the Winters Quick Change Gear Chart