Green / Medium 2” Kenimex main Spring for Nelson pumps and some Cockers, new. One included. Many available. These are 2” long and will fit the Majority of Nelson pumps. They will fit later Autocockers and Snipers with the pre cut back lower tube for the threaded IVG screw. I can never remember if Blue or Green is Medium Strong or Medium Light. Blue and Green are in the middle of the tension range for these Nelson Mainsprings.