Wolff Gunsprings is a manufacturer of precision springs for firearms. This pak is designed to help tune (lighten) trigger pull and function in competition pistols. Included in this pak are 1 ea of the 4, 4.5 and 5 Lb. reduced power striker springs, 1 ea extra power trigger spring (more is better), and 1 ea reduced power safety block plunger spring. 

G42 G43 and Gen 5 spring pak will not include the extra power trigger spring. 

Made in USA