Lose those extra pounds with Precision Gear’s Ultralite ® Gears, Lockers and Spools. The new Ultralite® gear sets drops nearly 6 pounds unlike your ordinary gear set and reduces the rotating mass. This weight reduction is three to five times less than that found in current "chopped gears." The Precision Gear Ultralite® Series of gears, lockers and spools are available in all popular 9" and 9.5" ratios from 3.89 to 6.50 and in both Street (8620 Steel) and Pro Gears (9310 Steel). Spools and Lockers are available in 31, 35 and 40 splines.