Wolff Gunsprings is a manufacturer of precision springs for firearms. This pak is designed to eliminate light primer strikes. For self defense and every day carry. Included in this pak are 1 ea 6Lb. hard hitting striker spring, 1 ea extra power trigger spring (more is better), and 1 ea reduced power safety block plunger spring.A must for home defense and every day carry.NOT FOR G42/G43 and ALL GEN 5 Made in USA All orders placed Mon-Fri after 7am Pacific Standard Time will be shipped the next day. All orders placed on Saturday will be shipped on Monday. NO INTERNATIONAL SHIPPING!!