This is a Package of 25 Pairs of E-Z Mate Mark II Magnetically Operated Knuckle Couplers from Bachmann. FEATURES: Coil springs are molded as an integral part of the coupler. Patent Pending Spring Retainers. Easy installation and operation. Fits most HO scale cars with built-in draft gear boxes (coupler pockets). Compatible with all magnetically operated knuckle couplers. These couplers are over shank-medium. Economical bulk carded packaging. INCLUDES: One Package of 25 Pairs of E-Z Mate Mark II Knuckle Couplers. REQUIRES: Under-Track Magnet HO Scale Train Equipment Adult Supervision SPECS: Scale: HO (1:87) COMMENTS: Choking Hazard: Keep away from children under 3 years of age. sdw 1/25/01 ir/jl