This Package Contains 12 Pairs of HO Scale Bachmann E-Z Mate® Mark II Magnetically Operated Knuckle Couplers (Center Shank--Medium). FEATURES: E-Z Mate® couplers operate with a standard metal "glad hand" and under-track magnet. Compatible with all magnetically operated knuckle couplers. Easy to install! Coil metal springs. Spring retainers. Installation instructions provided. INCLUDES: 12 Pairs of Couplers REQUIRES: Standard Metal Glad Hand Under-Track Magnet (BACU6684) SPECS: Scale: HO 1:87 COMMENTS: Bachmann"s under-track magnet comes with a trackside brakeman figure to indicate the magnet"s position (sold separately). kr3/15/01 ir/jl