This listing is for a new, in-package set of Bachmann E-Z Mate Mark II magnetically operated knuckle couplers. These couplers feature a NEM center shank (medium length) and are designed for simple conversion to E-Z Mate operation, fitting standard European coupler pockets. Each package contains a pair of couplers with coil springs and patent pending spring retainers. Ideal for model railroad enthusiasts looking to upgrade or replace couplers on their HO scale rolling stock.