The new and improved version has the whisker wire center rather than the gold center:

The #147 Kadee^® Magne-Matic^® WHISKER^® Coupler features a Metal Coupler, Metal WHISKER^® Centering Spring, insulated Draft Gear Box and Lid.

The #147 Coupler may be mounted with supplied draft gear box or with manufactures cast-on coupler pockets.

It is not recommended to use a metal coupler directly on a metal surface or in a metal draft gear box to avoid the possible electrical crossover or shorting that may cause damage. Use the provided insulated draft gear box.

Two pair per package